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Sivan M, Li Y, Veluri H, Zhao Y, Tang B, Wang X, Zamburg E, Leong JF, Niu JX, Chand U, Thean AVY. All WSe 2 1T1R resistive RAM cell for future monolithic 3D embedded memory integration. Nat Commun 2019; 10:5201. [PMID: 31729375 PMCID: PMC6858359 DOI: 10.1038/s41467-019-13176-4] [Citation(s) in RCA: 38] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2019] [Accepted: 10/11/2019] [Indexed: 11/17/2022] Open
Abstract
3D monolithic integration of logic and memory has been the most sought after solution to surpass the Von Neumann bottleneck, for which a low-temperature processed material system becomes inevitable. Two-dimensional materials, with their excellent electrical properties and low thermal budget are potential candidates. Here, we demonstrate a low-temperature hybrid co-integration of one-transistor-one-resistor memory cell, comprising a surface functionalized 2D WSe2p-FET, with a solution-processed WSe2 Resistive Random Access Memory. The employed plasma oxidation technique results in a low Schottky barrier height of 25 meV with a mobility of 230 cm2 V−1 s−1, leading to a 100x performance enhanced WSe2p-FET, while the defective WSe2 Resistive Random Access Memory exhibits a switching energy of 2.6 pJ per bit. Furthermore, guided by our device-circuit modelling, we propose vertically stacked channel FETs for high-density sub-0.01 μm2 memory cells, offering a new beyond-Si solution to enable 3-D embedded memories for future computing systems. Designing efficient, scalable and low-thermal-budget 2D Materials for 3D integration remains a challenge. Here, the authors report the development of a hybrid-(solution-processed-exfoliated) integration of 2D Material based 1T1R which uses a multilayer WSe2p-FET and a multilayer printed WSe2 RRAM.
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Affiliation(s)
- Maheswari Sivan
- Department of Electrical and Computer Engineering, National University of Singapore, 4 Engineering Drive 3, Singapore, 117583, Singapore
| | - Yida Li
- Department of Electrical and Computer Engineering, National University of Singapore, 4 Engineering Drive 3, Singapore, 117583, Singapore.
| | - Hasita Veluri
- Department of Electrical and Computer Engineering, National University of Singapore, 4 Engineering Drive 3, Singapore, 117583, Singapore
| | - Yunshan Zhao
- Department of Electrical and Computer Engineering, National University of Singapore, 4 Engineering Drive 3, Singapore, 117583, Singapore
| | - Baoshan Tang
- Department of Electrical and Computer Engineering, National University of Singapore, 4 Engineering Drive 3, Singapore, 117583, Singapore
| | - Xinghua Wang
- Department of Electrical and Computer Engineering, National University of Singapore, 4 Engineering Drive 3, Singapore, 117583, Singapore
| | - Evgeny Zamburg
- Department of Electrical and Computer Engineering, National University of Singapore, 4 Engineering Drive 3, Singapore, 117583, Singapore
| | - Jin Feng Leong
- Department of Electrical and Computer Engineering, National University of Singapore, 4 Engineering Drive 3, Singapore, 117583, Singapore
| | - Jessie Xuhua Niu
- Department of Electrical and Computer Engineering, National University of Singapore, 4 Engineering Drive 3, Singapore, 117583, Singapore
| | - Umesh Chand
- Department of Electrical and Computer Engineering, National University of Singapore, 4 Engineering Drive 3, Singapore, 117583, Singapore
| | - Aaron Voon-Yew Thean
- Department of Electrical and Computer Engineering, National University of Singapore, 4 Engineering Drive 3, Singapore, 117583, Singapore.
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52
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Mao S, Elshekh H, Kadhim MS, Xia Y, Fu G, Hou W, Zhao Y, Sun B. An excellent resistive switching memory behaviour based on assembled MoSe2 nanosphere arrays. J SOLID STATE CHEM 2019. [DOI: 10.1016/j.jssc.2019.120975] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
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53
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Microwave-assisted synthesis of CuSe nano-particles as a high -performance cathode for rechargeable magnesium batteries. Electrochim Acta 2019. [DOI: 10.1016/j.electacta.2019.134864] [Citation(s) in RCA: 35] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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54
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Hsieh YL, Su WH, Huang CC, Su CY. Solution-processed black phosphorus nanoflakes for integrating nonvolatile resistive random access memory and the mechanism unveiled. NANOTECHNOLOGY 2019; 30:445702. [PMID: 31349243 DOI: 10.1088/1361-6528/ab3606] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
In this study, we demonstrated the integration of black phosphorus (BP) nanoflakes in a resistive random access memory (RRAM) with a facile and complementary metal-oxide-semiconductor-compatible process. The solution-processed BP nanoflakes embedded in polystyrene (PS) as an active layer were sandwiched between aluminum electrodes (Al/BP:PS/Al). The device shows a figure of merit with typical bipolar behavior and forming-free characteristics as well as excellent memory performances such as nonvolatile, low operation voltage (1.75 V) and high ON/OFF ratio (>102) as well as the long retention time (>1500 s). The improved device performances were attributed to the formation of effective trap sites from the hybrid structure of the active layer (BP:PS), especially the BP nanoflakes and the partly oxidized species (P x O y ). Moreover, the extrinsic aluminum oxide layer was observed after the device operation. The mechanism of switching behavior was further unveiled through the carrier transport models, which confirms the conductive mechanisms of space-charge-limited current and Ohmic conductance at high resistance state (HRS) and low resistance state, respectively. Additionally, in the high electric field at HRS, the transfer curve was well fitted with the Poole-Frenkel emission model, which could be attributed to the formation of the aluminum oxide layer. Accordingly, both the trapping/de-trapping of carriers and the formation/rupture of conductive filaments were introduced as transport mechanisms in our devices. Although the partial P x O y species on BP were inevitable during the liquid phase exfoliation process, which was regarded as the disadvantages for various applications, it turns to a key point for improving performances in memory devices. The proposed approach to integrating BP nanoflakes in the active layer of the RRAM device could pave the way for next-generation memory devices.
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Affiliation(s)
- Yu-Ling Hsieh
- Dep. of Mechanical Engineering, National Central University, Tao-Yuan 32001, Taiwan
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55
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Shao JY, Cui BB, Tang JH, Zhong YW. Resistive memory switching of transition-metal complexes controlled by ligand design. Coord Chem Rev 2019. [DOI: 10.1016/j.ccr.2019.05.010] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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56
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Zhang L, Gong T, Wang H, Guo Z, Zhang H. Memristive devices based on emerging two-dimensional materials beyond graphene. NANOSCALE 2019; 11:12413-12435. [PMID: 31231746 DOI: 10.1039/c9nr02886b] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
With the explosion of data in the information universe and the approaching of fundamental limits in silicon-based flash memories, the exploration of new device architectures and alternative materials is necessary for next-generation memory technology. Accordingly, emerging two-dimensional (2D) material-based memristive devices have attracted increasing attention due to their unique properties and great potential in flexible and wearable devices, and even neuromorphic computing systems. Herein, we provide an overview of the recent progress on memristive devices based on 2D materials beyond graphene. The device structures and choice of active materials and electrodes materials are summarized for various types of 2D material-based memristive devices. Following the discussion and classification on the device performances and mechanisms, the challenges and perspectives on future research based on 2D materials are also presented.
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Affiliation(s)
- Lei Zhang
- Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials, Key Laboratory for the Green Preparation and Application of Functional Materials, Ministry of Education, School of Materials Science and Engineering, Hubei University, Wuhan 430062, China.
| | - Tian Gong
- Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials, Key Laboratory for the Green Preparation and Application of Functional Materials, Ministry of Education, School of Materials Science and Engineering, Hubei University, Wuhan 430062, China.
| | - Huide Wang
- Shenzhen Engineering Laboratory of Phosphorene and Optoelectronics, Shenzhen University, Shenzhen 518060, China.
| | - Zhinan Guo
- Shenzhen Engineering Laboratory of Phosphorene and Optoelectronics, Shenzhen University, Shenzhen 518060, China.
| | - Han Zhang
- Shenzhen Engineering Laboratory of Phosphorene and Optoelectronics, Shenzhen University, Shenzhen 518060, China.
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57
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González-García A, López-Pérez W, González-Hernández R, Rodríguez JA, Milośević MV, Peeters FM. Tunable 2D-gallium arsenide and graphene bandgaps in a graphene/GaAs heterostructure: an ab initio study. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2019; 31:265502. [PMID: 30840939 DOI: 10.1088/1361-648x/ab0d70] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
The bandgap behavior of 2D-GaAs and graphene have been investigated with van der Waals heterostructured into a yet unexplored graphene/GaAs bilayer, under both uniaxial stress along c axis and different planar strain distributions. The 2D-GaAs bandgap nature changes from [Formula: see text]-K indirect in isolated monolayer to [Formula: see text]-[Formula: see text] direct in graphene/GaAs bilayer. In the latter, graphene exhibits a bandgap of 5 meV. The uniaxial stress strongly affects the graphene electronic bandgap, while symmetric in-plane strain does not open the bandgap in graphene. Nevertheless, it induces remarkable changes on the GaAs bandgap-width around the Fermi level. However, when applying asymmetric in-plane strain to graphene/GaAs, the graphene sublattice symmetry is broken, and the graphene bandgap is open at the Fermi level to a maximum width of 814 meV. This value is much higher than that reported for just graphene under asymmetric strain. The [Formula: see text]-[Formula: see text] direct bandgap of GaAs remains unchanged in graphene/GaAs under different types of applied strain. The analyses of phonon dispersion and the elastic constants yield the dynamical and mechanical stability of the graphene/GaAs system, respectively. The calculated mechanical properties for bilayer heterostructure are better than those of their constituent monolayers. This finding, together with the tunable graphene bandgap not only by the strength but also by the direction of the strain, enhance the potential for strain engineering of ultrathin group-III-V electronic devices hybridized by graphene.
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Affiliation(s)
- A González-García
- Grupo de Investigación en Física Aplicada, Departamento de Física, Universidad del Norte, Barranquilla, Colombia. Departement Fysica, Universiteit Antwerpen, Groenenborgerlaan 171, B-2020 Antwerpen, Belgium
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58
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Electron transfer through protein-bound water and its bioelectronic application. Biosens Bioelectron 2019; 136:16-22. [PMID: 31029005 DOI: 10.1016/j.bios.2019.04.012] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2018] [Revised: 03/31/2019] [Accepted: 04/05/2019] [Indexed: 11/20/2022]
Abstract
This article reports that a metastructure of polypeptides with the bound water can have high and stable electron conductivity without classic electron-conducting components. We used gelatin as the model protein since the peptide chains contain numerous sites capable of forming hydrogen bonds with water molecules. The lack of redox sites and the trace amounts of aromatic amino acids also eliminate the possibility that the electron transfer is due to redox reactions or pi-stacking. Our Raman spectroscopy results show that the high electron-conductive metastructure is composed of bound water and unwound gelatin polypeptides. Further removal of bound water from the metastructure dramatically decreases the electron-conductivity, indicating that bound water is crucial to connect the polypeptide chains for the electron-conductivity. In addition, the ability to switch between the low-electron-conductive typical hydrogel state and the high-electron-conductive metastructure state of the gelatin hydrogel allows the gelatin hydrogel to exhibit rewritable nonvolatile resistive memory features. The high ON/OFF current ratio of 105 at a low reading voltage of 0.09 V is superior to that of conventional nonvolatile resistive memories by one order of magnitude. The discovered phenomenon of using bound water and flexible polypeptide structure for long-distance electron transfer could provide a new direction for designing highly biocompatible conducting materials or functional devices in bioelectronics.
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59
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Xia B, Ran J, Chen S, Song L, Zhang X, Jing L, Qiao SZ. A two-dimensional metal-organic framework accelerating visible-light-driven H 2 production. NANOSCALE 2019; 11:8304-8309. [PMID: 30982842 DOI: 10.1039/c9nr00663j] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
The rapid consumption of non-renewable fossil fuels and the relevant critical environmental issues have significantly boosted the demand for clean, renewable and carbon-free energy sources. The conversion of solar energy into green hydrogen (H2) via photocatalytic water splitting stands out as a promising, cost-effective and environmentally friendly technology. However, the realization of large-scale solar-driven photocatalytic H2 production relies on the development of inexpensive, efficient and stable photocatalysts. Here, for the first time, we report the fabrication of Zn0.8Cd0.2S (ZCS) nanoparticles (NPs) dispersed Co-based metal-organic layers (CMLs) using an easy self-assembly approach. The as-synthesized ZCS/CML composite shows a remarkable visible-light-induced H2-production activity of 18 102 μmol h-1 g-1, 492% higher than that of pure ZCS. A series of advanced characterization studies, e.g., synchrotron-based X-ray absorption near edge structure and time-resolved photoluminescence spectroscopy, disclose that the strong electronic interaction between ZCS and CML and the abundant reactive sites on the CML lead to the significantly improved photocatalytic H2-production activity. Our contribution not only demonstrates the application of CML as an earth-abundant support and promoter to tremendously boost photocatalytic H2 production without noble-metal co-catalysts, but also sheds light on the tailored design and synthesis of metal-organic-layer based materials for energy conversion and storage.
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Affiliation(s)
- Bingquan Xia
- School of Chemical Engineering, The University of Adelaide, Adelaide, SA 5005, Australia.
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60
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Ternary Memristic Effect of Trilayer-Structured Graphene-Based Memory Devices. NANOMATERIALS 2019; 9:nano9040518. [PMID: 30987015 PMCID: PMC6524159 DOI: 10.3390/nano9040518] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/21/2019] [Revised: 03/08/2019] [Accepted: 03/15/2019] [Indexed: 01/19/2023]
Abstract
A tristable memory device with a trilayer structure utilizes poly(methyl methacrylate) (PMMA) sandwiched between double-stacked novel nanocomposite films that consist of 2-(4-tert-butylphenyl)-5-(4-biphenylyl)-1,3,4-oxadiazole (PBD) doped with graphene oxide (GO). We successfully fabricated devices consisting of single and double GO@PBD nanocomposite films embedded in polymer layers. These devices had binary and ternary nonvolatile resistive switching behaviors, respectively. Binary memristic behaviors were observed for the device with a single GO@PBD nanocomposite film, while ternary behaviors were observed for the device with the double GO@PBD nanocomposite films. The heterostructure GO@PBD/PMMA/GO@PBD demonstrated ternary charge transport on the basis of I–V fitting curves and energy-band diagrams. Tristable memory properties could be enhanced by this novel trilayer structure. These results show that the novel graphene-based memory devices with trilayer structure can be applied to memristic devices. Charge trap materials with this innovative architecture for memristic devices offer a novel design scheme for multi-bit data storage.
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Wu X, Ge R, Chen PA, Chou H, Zhang Z, Zhang Y, Banerjee S, Chiang MH, Lee JC, Akinwande D. Thinnest Nonvolatile Memory Based on Monolayer h-BN. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2019; 31:e1806790. [PMID: 30773734 DOI: 10.1002/adma.201806790] [Citation(s) in RCA: 69] [Impact Index Per Article: 13.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/19/2018] [Revised: 01/31/2019] [Indexed: 06/09/2023]
Abstract
2D materials have attracted much interest over the past decade in nanoelectronics. However, it was believed that the atomically thin layered materials are not able to show memristive effect in vertically stacked structure, until the recent discovery of monolayer transition metal dichalcogenide (TMD) atomristors, overcoming the scaling limit to sub-nanometer. Herein, the nonvolatile resistance switching (NVRS) phenomenon in monolayer hexagonal boron nitride (h-BN), a typical 2D insulator, is reported. The h-BN atomristors are studied using different electrodes and structures, featuring forming-free switching in both unipolar and bipolar operations, with large on/off ratio (up to 107 ). Moreover, fast switching speed (<15 ns) is demonstrated via pulse operation. Compared with monolayer TMDs, the one-atom-thin h-BN sheet reduces the vertical scaling to ≈0.33 nm, representing a record thickness for memory materials. Simulation results based on ab-initio method reveal that substitution of metal ions into h-BN vacancies during electrical switching is a likely mechanism. The existence of NVRS in monolayer h-BN indicates fruitful interactions between defects, metal ions and interfaces, and can advance emerging applications on ultrathin flexible memory, printed electronics, neuromorphic computing, and radio frequency switches.
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Affiliation(s)
- Xiaohan Wu
- Microelectronics Research Center, University of Texas at Austin, Austin, TX, 78758, USA
| | - Ruijing Ge
- Microelectronics Research Center, University of Texas at Austin, Austin, TX, 78758, USA
| | - Po-An Chen
- Microelectronics Research Center, University of Texas at Austin, Austin, TX, 78758, USA
- Institute of Microelectronics, Department of Electrical Engineering, National Cheng Kung University, Tainan, 701, Taiwan
| | - Harry Chou
- Microelectronics Research Center, University of Texas at Austin, Austin, TX, 78758, USA
| | - Zhepeng Zhang
- Department of Materials Science and Engineering, College of Engineering, Peking University, Beijing, 100871, China
| | - Yanfeng Zhang
- Department of Materials Science and Engineering, College of Engineering, Peking University, Beijing, 100871, China
| | - Sanjay Banerjee
- Microelectronics Research Center, University of Texas at Austin, Austin, TX, 78758, USA
| | - Meng-Hsueh Chiang
- Institute of Microelectronics, Department of Electrical Engineering, National Cheng Kung University, Tainan, 701, Taiwan
| | - Jack C Lee
- Microelectronics Research Center, University of Texas at Austin, Austin, TX, 78758, USA
| | - Deji Akinwande
- Microelectronics Research Center, University of Texas at Austin, Austin, TX, 78758, USA
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Bertolazzi S, Bondavalli P, Roche S, San T, Choi SY, Colombo L, Bonaccorso F, Samorì P. Nonvolatile Memories Based on Graphene and Related 2D Materials. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2019; 31:e1806663. [PMID: 30663121 DOI: 10.1002/adma.201806663] [Citation(s) in RCA: 101] [Impact Index Per Article: 20.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/14/2018] [Revised: 11/19/2018] [Indexed: 05/19/2023]
Abstract
The pervasiveness of information technologies is generating an impressive amount of data, which need to be accessed very quickly. Nonvolatile memories (NVMs) are making inroads into high-capacity storage to replace hard disk drives, fuelling the expansion of the global storage memory market. As silicon-based flash memories are approaching their fundamental limit, vertical stacking of multiple memory cell layers, innovative device concepts, and novel materials are being investigated. In this context, emerging 2D materials, such as graphene, transition metal dichalcogenides, and black phosphorous, offer a host of physical and chemical properties, which could both improve existing memory technologies and enable the next generation of low-cost, flexible, and wearable storage devices. Herein, an overview of graphene and related 2D materials (GRMs) in different types of NVM cells is provided, including resistive random-access, flash, magnetic and phase-change memories. The physical and chemical mechanisms underlying the switching of GRM-based memory devices studied in the last decade are discussed. Although at this stage most of the proof-of-concept devices investigated do not compete with state-of-the-art devices, a number of promising technological advancements have emerged. Here, the most relevant material properties and device structures are analyzed, emphasizing opportunities and challenges toward the realization of practical NVM devices.
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Affiliation(s)
- Simone Bertolazzi
- Université de Strasbourg, CNRS, ISIS UMR 7006, 8 allée Gaspard Monge, 67000, Strasbourg, France
| | - Paolo Bondavalli
- Chemical and Multifunctional Materials Lab, Thales Research and Technology, 91767, Palaiseau, France
| | - Stephan Roche
- Catalan Institute of Nanoscience and Nanotechnology, CSIC and The Barcelona Institute of Science and Technology, Campus UAB, Bellaterra, 08193, Barcelona, Spain
- ICREA-Institució Catalana de Recerca i Estudis Avançats, 08070, Barcelona, Spain
| | - Tamer San
- Texas Instruments, Dallas, TX, 75243, USA
| | - Sung-Yool Choi
- School of Electrical Engineering, Graphene/2D Materials Research Center, KAIST, 34141, Daejeon, Korea
| | - Luigi Colombo
- Department of Materials Science and Engineering, University of Texas at Dallas, Richardson, TX, 75080, USA
| | - Francesco Bonaccorso
- Istituto Italiano di Tecnologia, Graphene Labs, Via Morego 30, I-16163, Genova, Italy
- BeDimensional Spa, Via Albisola 121, 16163, Genova, Italy
| | - Paolo Samorì
- Université de Strasbourg, CNRS, ISIS UMR 7006, 8 allée Gaspard Monge, 67000, Strasbourg, France
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63
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Cao Y, Zhang B, Tian X, Gu M, Chen Y. Direct covalent modification of black phosphorus quantum dots with conjugated polymers for information storage. NANOSCALE 2019; 11:3527-3533. [PMID: 30747199 DOI: 10.1039/c8nr09711a] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
It has long been recognized that a small switching bias window, which is defined as the difference between the switch-on and switch-off voltages (Δ|VON - VOFF|), and a high ON/OFF current ratio would be greatly favorable to reduce the power consumption of memory devices and to decrease the information misreading rate in digital memory devices. In contrast to two-dimensional BP nanosheets, zero dimensional BP quantum dots (BPQDs) show more exciting physical and chemical properties. By using newly synthesized poly[(9,9-dioctyl-9H-fluorene)-alt-(4-(9H-carbazol-9-yl)aniline)] (PFCz-NH2) as the synthetic precursor, a highly soluble diazotated polymer, PFCz-N2+BF4-, was successfully synthesized and used to react with BPQDs under aqueous conditions to give the first conjugated polymer covalently functionalized BPQDs (PFCz-g-BPQDs). The as-prepared Al/PFCz-g-BPQDs/ITO device exhibits excellent nonvolatile rewritable memory performance, with a large ON/OFF current ratio (>107) and low switch-on/off voltages (-0.89/+1.95 V). In contrast, the Al/PFCz-NH2 : BPQDs blend/ITO device also shows a rewritable memory effect, but its ON/OFF current ratio and Δ|VON - VOFF| value are found to be 3 × 103 and 5.47 (Δ|+2.53-2.94|), respectively. This work, which offers an easy one-step strategy for direct covalent functionalization of BPQDs, opens a way to explore more applications of BPQDs.
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Affiliation(s)
- Yaming Cao
- Key Laboratory for Advanced Materials, Institute of Applied Chemistry, School of Chemistry and Molecular Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, China.
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Wang Z, Rafai S, Qiao C, Jia J, Zhu Y, Ma X, Cao C. Microwave-Assisted Synthesis of CuS Hierarchical Nanosheets as the Cathode Material for High-Capacity Rechargeable Magnesium Batteries. ACS APPLIED MATERIALS & INTERFACES 2019; 11:7046-7054. [PMID: 30667214 DOI: 10.1021/acsami.8b20533] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Rechargeable magnesium batteries (rMBs) have been recognized as one of most promising next-generation energy storage devices with high energy and power density. However, the development of rMBs has been hampered by the lack of usable cathode materials with high capacity and cycling stability. Herein, we report an ultra-rapid, cost-effective, and scalable synthesis of ultrathin CuS hierarchical nanosheets by a one-step microwave-assisted preparation. Benefiting from the exceptional structural configuration, when used as the cathode material for rMBs at room temperature, the CuS hierarchical nanosheets deliver a high reversible discharge capacity of 300 mA h g-1 at 20 mA g-1, remarkable rate capability (256.5 mA h g-1 at 50 mA g-1 and 237.5 mA h g-1 at 100 mA g-1), and excellent cycling stability (135 mA h g-1 at 200 mA g-1 over 200 cycles). To date, the obtained excellent electrochemical performances are superior to most results ever reported for cathode materials of rMBs.
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Affiliation(s)
- Zhitao Wang
- Research Center of Materials Science, Beijing Key Laboratory of Construction Tailorable Advanced Functional Materials and Green Applications , Beijing Institute of Technology , Beijing 100081 , China
| | - Souleymen Rafai
- Research Center of Materials Science, Beijing Key Laboratory of Construction Tailorable Advanced Functional Materials and Green Applications , Beijing Institute of Technology , Beijing 100081 , China
| | - Chen Qiao
- Research Center of Materials Science, Beijing Key Laboratory of Construction Tailorable Advanced Functional Materials and Green Applications , Beijing Institute of Technology , Beijing 100081 , China
| | - Jian Jia
- Research Center of Materials Science, Beijing Key Laboratory of Construction Tailorable Advanced Functional Materials and Green Applications , Beijing Institute of Technology , Beijing 100081 , China
| | - Youqi Zhu
- Research Center of Materials Science, Beijing Key Laboratory of Construction Tailorable Advanced Functional Materials and Green Applications , Beijing Institute of Technology , Beijing 100081 , China
| | - Xilan Ma
- Research Center of Materials Science, Beijing Key Laboratory of Construction Tailorable Advanced Functional Materials and Green Applications , Beijing Institute of Technology , Beijing 100081 , China
| | - Chuanbao Cao
- Research Center of Materials Science, Beijing Key Laboratory of Construction Tailorable Advanced Functional Materials and Green Applications , Beijing Institute of Technology , Beijing 100081 , China
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65
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Ravi B, Bhattacharjee M, Ghosh A, Bandyopadhyay D. Fabrication of pixelated liquid crystal nanostructures employing the contact line instabilities of droplets. NANOSCALE 2019; 11:1680-1691. [PMID: 30620017 DOI: 10.1039/c8nr08400a] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
A liquid crystal (LC) droplet resting on a poly-dimethylsiloxane substrate could rapidly spread upon solvent vapour annealing to form a non-uniform film. While the solvophobic surfaces restricted the spreading of the droplet to form a thicker film upon solvent annealing, the solvophilic substrates allowed the formation of a thinner film under similar conditions. Withdrawal of the solvent exposure caused rapid evaporation of the solvent molecules from the film, especially near the retracting contact-line to form microscale LC-droplets, which shrunk into nanoscopic ones after evaporation of the excess solvent. The thinner films on solvophilic surfaces allowed the formation of droplets with smaller size and periodicity as small as ∼100 nm and ∼200 nm, respectively. Furthermore, the use of a patterned substrate could impose a large-area ordering on the nanodroplets. A theoretical model for an evaporating film of LC-solution revealed that the spacing of nanodroplets could be decided by the interplay of stabilizing and destabilizing components of capillary force while van der Waals interaction played a supportive role when the film was ultrathin near the contact line. The micro/nanodroplets thus formed showed an anomalous oscillatory rotational motion originating from the difference in the Laplace pressure near contact lines under the influence of an external electric field. The application of the Lorenz force to these droplets showed translation and rotational motions followed by ejection of satellite droplets.
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Affiliation(s)
- Bolleddu Ravi
- Department of Chemical Engineering, Indian Institute of Technology Guwahati, India.
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66
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Wang D, Kan X, Wu C, Lin X, Zheng H, Li K, Zhao J, Zhao Y. Interfacial synthesis of ultrathin two-dimensional 2PbCO 3·Pb(OH) 2 nanosheets with high enzyme mimic catalytic activity. Inorg Chem Front 2019. [DOI: 10.1039/c8qi01196f] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Ultrathin two-dimensional 2PbCO3·Pb(OH)2 nanosheets have been facilely synthesized at the gas/liquid interface and exhibit higher catalytic activity as peroxidase mimetic for the oxidation of TMB.
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Affiliation(s)
- Danbo Wang
- Key Laboratory of Biobased Polymer Materials
- Shandong Provincial Education Department
- College of Polymer Science and Engineering
- Qingdao University of Science and Technology
- Qingdao 266042
| | - Xiaonan Kan
- Key Laboratory of Biobased Polymer Materials
- Shandong Provincial Education Department
- College of Polymer Science and Engineering
- Qingdao University of Science and Technology
- Qingdao 266042
| | - Chenyu Wu
- Centre for Advanced Macromolecular Design
- School of Chemical Engineering
- The University of New South Wales
- Sydney
- Australia
| | - Xiaohuan Lin
- Center of High Pressure Science and Technology Advanced Research
- Beijing 100094
- P. R. China
| | - Haiyan Zheng
- Center of High Pressure Science and Technology Advanced Research
- Beijing 100094
- P. R. China
| | - Kuo Li
- Center of High Pressure Science and Technology Advanced Research
- Beijing 100094
- P. R. China
| | - Jikuan Zhao
- Key Laboratory of Optic-electric Sensing and Analytical Chemistry for Life Science
- MOE
- State Key Laboratory Base of Eco-chemical Engineering
- College of Chemistry and Molecular Engineering
- Qingdao University of Science and Technology
| | - Yingjie Zhao
- Key Laboratory of Biobased Polymer Materials
- Shandong Provincial Education Department
- College of Polymer Science and Engineering
- Qingdao University of Science and Technology
- Qingdao 266042
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67
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Ghosh A, Bandyopadhyay D, Sharma A. Electric field mediated elastic contact lithography of thin viscoelastic films for miniaturized and multiscale patterns. SOFT MATTER 2018; 14:3963-3977. [PMID: 29736548 DOI: 10.1039/c8sm00428e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Elastic contact lithography (ECL) and electric field lithography (EFL) have both shown significant potential to develop large-area micropatterns on polymeric surfaces. Recently, the major challenges associated with these processes have been the improvement of the aspect ratio and reduction in the size and periodicity of the patterns fabricated. Herein, with the help of non-linear simulations, we show that combining these methods can be one recipe to overcome these limitations. We consider a linear viscoelastic film for the linear and non-linear analyses. In this regard, we explore the role of the moving contactor to improve the aspect ratio of the patterns. The study uncovers that (i) combined destabilizing influences originating from van der Waals and electric field forces ensure smaller timescales and length scales for the instabilities, (ii) the aid from the electric field helps to improve the minimum separation distance so that the contact instability initiates at a larger separation distance, (iii) a long-range ordering can be inflicted on the patterns on the polymer surfaces when electrodes with periodic physicochemical patterns are used and (iv) the strength of the externally applied electric field and the ratio of elastic to viscous compliance of the film play crucial roles in deciding the different modes of debonding of the film - peeling, catastrophic or coalescence. The proposed method can improve the aspect ratio of patterns by ∼9-fold during the peeling mode of debonding. Furthermore, pathways to develop technologically important biomimetic surfaces with multiscale and hierarchical structures have been shown.
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Affiliation(s)
- Abir Ghosh
- Department of Chemical Engineering, Indian Institute of Technology Kanpur, Uttar Pradesh 208016, India.
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68
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He HK, Yang R, Zhou W, Huang HM, Xiong J, Gan L, Zhai TY, Guo X. Photonic Potentiation and Electric Habituation in Ultrathin Memristive Synapses Based on Monolayer MoS 2. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2018; 14:e1800079. [PMID: 29504245 DOI: 10.1002/smll.201800079] [Citation(s) in RCA: 73] [Impact Index Per Article: 12.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/08/2018] [Indexed: 05/22/2023]
Abstract
Monolayer of 2D transition metal dichalcogenides, with a thickness of less than 1 nm, paves a feasible path to the development of ultrathin memristive synapses, to fulfill the requirements for constructing large-scale high density 3D stacking neuromorphic chips. Herein, memristive devices based on monolayer n-MoS2 on p-Si substrate with a large self-rectification ratio, exhibiting photonic potentiation and electric habituation, are successfully fabricated. Versatile synaptic neuromorphic functions, such as potentiation/habituation, short-term/long-term plasticity, and paired-pulse facilitation, are successfully mimicked based on the inherent persistent photoconductivity performance and the volatile resistive switching behavior. These findings demonstrate the potential applications of ultrathin transition metal dichalcogenides for memristive synapses. These memristive synapses with the combination of photonic and electric neuromorphic functions have prospective in the applications of synthetic retinas and optoelectronic interfaces for integrated photonic circuits based on mixed-mode electro-optical operation.
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Affiliation(s)
- Hui-Kai He
- School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan, 430074, P. R. China
| | - Rui Yang
- School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan, 430074, P. R. China
| | - Wen Zhou
- School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan, 430074, P. R. China
| | - He-Ming Huang
- School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan, 430074, P. R. China
| | - Jue Xiong
- School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan, 430074, P. R. China
| | - Lin Gan
- School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan, 430074, P. R. China
| | - Tian-You Zhai
- School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan, 430074, P. R. China
| | - Xin Guo
- School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan, 430074, P. R. China
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69
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Samadi M, Sarikhani N, Zirak M, Zhang H, Zhang HL, Moshfegh AZ. Group 6 transition metal dichalcogenide nanomaterials: synthesis, applications and future perspectives. NANOSCALE HORIZONS 2018; 3:90-204. [PMID: 32254071 DOI: 10.1039/c7nh00137a] [Citation(s) in RCA: 116] [Impact Index Per Article: 19.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Group 6 transition metal dichalcogenides (G6-TMDs), most notably MoS2, MoSe2, MoTe2, WS2 and WSe2, constitute an important class of materials with a layered crystal structure. Various types of G6-TMD nanomaterials, such as nanosheets, nanotubes and quantum dot nano-objects and flower-like nanostructures, have been synthesized. High thermodynamic stability under ambient conditions, even in atomically thin form, made nanosheets of these inorganic semiconductors a valuable asset in the existing library of two-dimensional (2D) materials, along with the well-known semimetallic graphene and insulating hexagonal boron nitride. G6-TMDs generally possess an appropriate bandgap (1-2 eV) which is tunable by size and dimensionality and changes from indirect to direct in monolayer nanosheets, intriguing for (opto)electronic, sensing, and solar energy harvesting applications. Moreover, rich intercalation chemistry and abundance of catalytically active edge sites make them promising for fabrication of novel energy storage devices and advanced catalysts. In this review, we provide an overview on all aspects of the basic science, physicochemical properties and characterization techniques as well as all existing production methods and applications of G6-TMD nanomaterials in a comprehensive yet concise treatment. Particular emphasis is placed on establishing a linkage between the features of production methods and the specific needs of rapidly growing applications of G6-TMDs to develop a production-application selection guide. Based on this selection guide, a framework is suggested for future research on how to bridge existing knowledge gaps and improve current production methods towards technological application of G6-TMD nanomaterials.
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Affiliation(s)
- Morasae Samadi
- Department of Physics, Sharif University of Technology, Tehran 11155-9161, Iran.
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Kuang SY, Zhu G, Wang ZL. Triboelectrification-Enabled Self-Powered Data Storage. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2018; 5:1700658. [PMID: 29619315 PMCID: PMC5826983 DOI: 10.1002/advs.201700658] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/28/2017] [Revised: 10/31/2017] [Indexed: 05/19/2023]
Abstract
Data storage by any means usually requires an electric driving power for writing or reading. A novel approach for self-powered, triboelectrification-enabled data storage (TEDS) is presented. Data are incorporated into a set of metal-based surface patterns. As a probe slides across the patterned surface, triboelectrification between the scanning probe and the patterns produces alternatively varying voltage signal in quasi-square wave. The trough and crest of the quasi-square wave signal are coded as binary bits of "0" and "1," respectively, while the time span of the trough and the crest is associated with the number of bits. The storage of letters and sentences is demonstrated through either square-shaped or disc-shaped surface patterns. Based on experimental data and numerical calculation, the theoretically predicted maximum data storage density could reach as high as 38.2 Gbit in-2. Demonstration of real-time data retrieval is realized with the assistance of software interface. For the TEDS reported in this work, the measured voltage signal is self-generated as a result of triboelectrification without the reliance on an external power source. This feature brings about not only low power consumption but also a much more simplified structure. Therefore, this work paves a new path to a unique approach of high-density data storage that may have widespread applications.
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Affiliation(s)
- Shuang Yang Kuang
- Beijing Institute of Nanoenergy and NanosystemsChinese Academy of SciencesBeijing100083P. R. China
- Institute of SemiconductorsChinese Academy of SciencesBeijing100083P. R. China
- University of Chinese Academy of SciencesBeijing100049P. R. China
| | - Guang Zhu
- Beijing Institute of Nanoenergy and NanosystemsChinese Academy of SciencesBeijing100083P. R. China
- CAS Center for Excellence in NanoscienceNational Center for Nanoscience and Technology (NCNST)Beijing100083P. R. China
| | - Zhong Lin Wang
- Beijing Institute of Nanoenergy and NanosystemsChinese Academy of SciencesBeijing100083P. R. China
- University of Chinese Academy of SciencesBeijing100049P. R. China
- CAS Center for Excellence in NanoscienceNational Center for Nanoscience and Technology (NCNST)Beijing100083P. R. China
- School of Materials Science and EngineeringGeorgia Institute of TechnologyAtlantaGA30332USA
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71
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Liu Z, Song M, Ju S, Huang X, Wang X, Shi X, Zhu Y, Wang Z, Chen J, Li H, Cheng Y, Xie L, Liu J, Huang W. Wafer-Scale Ultrathin Two-Dimensional Conjugated Microporous Polymers: Preparation and Application in Heterostructure Devices. ACS APPLIED MATERIALS & INTERFACES 2018; 10:4010-4017. [PMID: 29320627 DOI: 10.1021/acsami.7b17854] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
In this work, we report a universal surface-assisted oxidative polymerization strategy for wafer-scale fabrication of ultrathin two-dimensional conjugated microporous polymers (2D CMPs) on arbitrary substrates under ambient conditions. Three kinds of 2D CMPs with average thickness of 1.5-3.6 nm were prepared on SiO2/Si substrates by using carbazole based monomers. Moreover, 2D CMPs can be grown on reduced graphene oxide (rGO) substrate to construct large-area 2D CMP/rGO heterostructure. As a proof-of-concept demonstration, an organic vertical field-effect transistor based on 2D CMP/rGO heterostructures was fabricated, which exhibited typical p-type behavior with high reproducibility and on/off current ratio. Most importantly, the direct growth of large-area 2D CMPs on arbitrary substrates is compatible with the conventional processes in the semiconductor industry, and therefore is expected to expedite the development of 2D CMPs as building blocks for construction of practical electronic devices.
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Affiliation(s)
- Zhengdong Liu
- Key Laboratory of Flexible Electronics (KLOFE) & Institute of Advanced Materials (IAM), Nanjing Tech University (NanjingTech) , 30 South Puzhu Road, Nanjing 211816, China
| | - Mengya Song
- Key Laboratory of Flexible Electronics (KLOFE) & Institute of Advanced Materials (IAM), Nanjing Tech University (NanjingTech) , 30 South Puzhu Road, Nanjing 211816, China
| | - Shang Ju
- Key Laboratory of Flexible Electronics (KLOFE) & Institute of Advanced Materials (IAM), Nanjing Tech University (NanjingTech) , 30 South Puzhu Road, Nanjing 211816, China
| | - Xiao Huang
- Key Laboratory of Flexible Electronics (KLOFE) & Institute of Advanced Materials (IAM), Nanjing Tech University (NanjingTech) , 30 South Puzhu Road, Nanjing 211816, China
| | - Xiangjing Wang
- Key Laboratory of Flexible Electronics (KLOFE) & Institute of Advanced Materials (IAM), Nanjing Tech University (NanjingTech) , 30 South Puzhu Road, Nanjing 211816, China
| | - Xiaotong Shi
- Key Laboratory of Flexible Electronics (KLOFE) & Institute of Advanced Materials (IAM), Nanjing Tech University (NanjingTech) , 30 South Puzhu Road, Nanjing 211816, China
| | - Ya Zhu
- Key Laboratory of Flexible Electronics (KLOFE) & Institute of Advanced Materials (IAM), Nanjing Tech University (NanjingTech) , 30 South Puzhu Road, Nanjing 211816, China
| | - Zhan Wang
- Key Laboratory of Flexible Electronics (KLOFE) & Institute of Advanced Materials (IAM), Nanjing Tech University (NanjingTech) , 30 South Puzhu Road, Nanjing 211816, China
| | - Jie Chen
- Key Laboratory of Flexible Electronics (KLOFE) & Institute of Advanced Materials (IAM), Nanjing Tech University (NanjingTech) , 30 South Puzhu Road, Nanjing 211816, China
| | - Hai Li
- Key Laboratory of Flexible Electronics (KLOFE) & Institute of Advanced Materials (IAM), Nanjing Tech University (NanjingTech) , 30 South Puzhu Road, Nanjing 211816, China
| | - Yingchun Cheng
- Key Laboratory of Flexible Electronics (KLOFE) & Institute of Advanced Materials (IAM), Nanjing Tech University (NanjingTech) , 30 South Puzhu Road, Nanjing 211816, China
| | - Linghai Xie
- Key Laboratory for Organic Electronics and Information Displays & Institute of Advanced Materials (IAM), SICAM, Nanjing University of Posts & Telecommunications , 9 Wenyuan Road, Nanjing 210023, China
| | - Juqing Liu
- Key Laboratory of Flexible Electronics (KLOFE) & Institute of Advanced Materials (IAM), Nanjing Tech University (NanjingTech) , 30 South Puzhu Road, Nanjing 211816, China
| | - Wei Huang
- Key Laboratory of Flexible Electronics (KLOFE) & Institute of Advanced Materials (IAM), Nanjing Tech University (NanjingTech) , 30 South Puzhu Road, Nanjing 211816, China
- Key Laboratory for Organic Electronics and Information Displays & Institute of Advanced Materials (IAM), SICAM, Nanjing University of Posts & Telecommunications , 9 Wenyuan Road, Nanjing 210023, China
- Shaanxi Institute of Flexible Electronics (SIFE), Northwestern Polytechnical University (NPU) , 127 West Youyi Road, Xi'an 710072, China
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Ge R, Wu X, Kim M, Shi J, Sonde S, Tao L, Zhang Y, Lee JC, Akinwande D. Atomristor: Nonvolatile Resistance Switching in Atomic Sheets of Transition Metal Dichalcogenides. NANO LETTERS 2018; 18:434-441. [PMID: 29236504 DOI: 10.1021/acs.nanolett.7b04342] [Citation(s) in RCA: 150] [Impact Index Per Article: 25.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Recently, two-dimensional (2D) atomic sheets have inspired new ideas in nanoscience including topologically protected charge transport,1,2 spatially separated excitons,3 and strongly anisotropic heat transport.4 Here, we report the intriguing observation of stable nonvolatile resistance switching (NVRS) in single-layer atomic sheets sandwiched between metal electrodes. NVRS is observed in the prototypical semiconducting (MX2, M = Mo, W; and X = S, Se) transitional metal dichalcogenides (TMDs),5 which alludes to the universality of this phenomenon in TMD monolayers and offers forming-free switching. This observation of NVRS phenomenon, widely attributed to ionic diffusion, filament, and interfacial redox in bulk oxides and electrolytes,6-9 inspires new studies on defects, ion transport, and energetics at the sharp interfaces between atomically thin sheets and conducting electrodes. Our findings overturn the contemporary thinking that nonvolatile switching is not scalable to subnanometre owing to leakage currents.10 Emerging device concepts in nonvolatile flexible memory fabrics, and brain-inspired (neuromorphic) computing could benefit substantially from the wide 2D materials design space. A new major application, zero-static power radio frequency (RF) switching, is demonstrated with a monolayer switch operating to 50 GHz.
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Affiliation(s)
- Ruijing Ge
- Microelectronics Research Center, The University of Texas at Austin , Austin, Texas 78758, United States
| | - Xiaohan Wu
- Microelectronics Research Center, The University of Texas at Austin , Austin, Texas 78758, United States
| | - Myungsoo Kim
- Microelectronics Research Center, The University of Texas at Austin , Austin, Texas 78758, United States
| | - Jianping Shi
- Department of Materials Science and Engineering, College of Engineering, Peking University , Beijing 100871, China
| | - Sushant Sonde
- Institute for Molecular Engineering, University of Chicago , 5640 South Ellis Avenue, Chicago, Illinois 60637, United States
- Center for Nanoscale Materials, Argonne National Laboratory , 9700 Cass Avenue, Lemont, Illinois 60439, United States
| | - Li Tao
- Microelectronics Research Center, The University of Texas at Austin , Austin, Texas 78758, United States
- School of Materials Science and Engineering, Southeast University , 2 Southeast University Road, Nanjing 211189, China
| | - Yanfeng Zhang
- Department of Materials Science and Engineering, College of Engineering, Peking University , Beijing 100871, China
| | - Jack C Lee
- Microelectronics Research Center, The University of Texas at Austin , Austin, Texas 78758, United States
| | - Deji Akinwande
- Microelectronics Research Center, The University of Texas at Austin , Austin, Texas 78758, United States
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Li J, Hong M, Sun L, Zhang W, Shu H, Chang H. Enhanced Electrocatalytic Hydrogen Evolution from Large-Scale, Facile-Prepared, Highly Crystalline WTe 2 Nanoribbons with Weyl Semimetallic Phase. ACS APPLIED MATERIALS & INTERFACES 2018; 10:458-467. [PMID: 29235847 DOI: 10.1021/acsami.7b13387] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Tungsten ditellurium (WTe2) is one of most important layered transition metal dichalcogenides (TMDs) and exhibits various prominent physical properties. All the present methods for WTe2 preparation need strict conditions such as high temperature or cannot be applied in large scale, which limits its practical applications. In addition, most studies on WTe2 focus on its physical properties, whereas its electrochemical properties are still illusive with little investigation. Here, we develop a facile and scalable two-step method to synthesize high-quality WTe2 nanoribbon crystals with 1T' Weyl semimetal phase for the first time. Highly crystalline 1T'-WTe2 nanoribbons can be obtained on a large scale through this two-step method. In addition, the electrochemical tests show that WTe2 nanoribbons exhibit smaller overpotential and much better hydrogen evolution reaction catalytic performance than other tungsten-based sulfide and selenide (WS2, WSe2) nanoribbons of same morphology and under same preparation conditions. WTe2 nanoribbons show a Tafel slope of 57 mV/dec, which is one of best values for TMD catalysts and about 2 and 4 times smaller than that for 2H-WS2 nanoribbons (135 mV/dec) and 2H-WSe2 nanoribbons (213 mV/dec), respectively. 1T'-WTe2 nanoribbons also show ultrahigh stability in 5000 cycles and 20 h at 10 mA/cm2. The better performance is attributed to high conductivity of semimetallic 1T'-phase-stable WTe2 nanoribbons with one or two order higher charge-transfer rate than normally semiconducting 2H-stable WS2 and WSe2 nanoribbons. These results open the door for electrochemical applications of Weyl semimetallic TMDs.
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Affiliation(s)
- Jie Li
- Center for Joining and Electronic Packaging, State Key Laboratory of Material Processing and Die & Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology , Wuhan 430074, China
| | - Meiling Hong
- Center for Joining and Electronic Packaging, State Key Laboratory of Material Processing and Die & Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology , Wuhan 430074, China
- College of Chemistry and Environmental Engineering, Wuhan Institute of Technology , Wuhan 430073, China
| | - Leijie Sun
- Center for Joining and Electronic Packaging, State Key Laboratory of Material Processing and Die & Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology , Wuhan 430074, China
| | - Wenfeng Zhang
- Center for Joining and Electronic Packaging, State Key Laboratory of Material Processing and Die & Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology , Wuhan 430074, China
| | - Haibo Shu
- College of Optical and Electronic Technology, China Jiliang Univeristy , Hangzhou 310018, China
| | - Haixin Chang
- Center for Joining and Electronic Packaging, State Key Laboratory of Material Processing and Die & Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology , Wuhan 430074, China
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Wang H, Zhou F, Wu L, Xiao X, Gu PY, Jiang J, Xu QF, Lu JM. An all-in-one memory cell based on a homopolymer with a pyrene side chain and its volatile and nonvolatile resistive switch behaviors. Polym Chem 2018. [DOI: 10.1039/c7py01925d] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Memory devices based on PMPPE exhibit a rewritable ternary memory behaviour (0, 1, 2, three conductivity states).
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Affiliation(s)
- Hongliang Wang
- College of Chemistry
- Chemical Engineering and Materials Science
- Collaborative Innovation
- Center of Suzhou Nano Science and Technology
- Soochow University
| | - Feng Zhou
- College of Chemistry
- Chemical Engineering and Materials Science
- Collaborative Innovation
- Center of Suzhou Nano Science and Technology
- Soochow University
| | - Linxin Wu
- College of Chemistry
- Chemical Engineering and Materials Science
- Collaborative Innovation
- Center of Suzhou Nano Science and Technology
- Soochow University
| | - Xiong Xiao
- College of Chemistry
- Chemical Engineering and Materials Science
- Collaborative Innovation
- Center of Suzhou Nano Science and Technology
- Soochow University
| | - Pei-Yang Gu
- College of Chemistry
- Chemical Engineering and Materials Science
- Collaborative Innovation
- Center of Suzhou Nano Science and Technology
- Soochow University
| | - Jun Jiang
- College of Chemistry
- Chemical Engineering and Materials Science
- Collaborative Innovation
- Center of Suzhou Nano Science and Technology
- Soochow University
| | - Qing-Feng Xu
- College of Chemistry
- Chemical Engineering and Materials Science
- Collaborative Innovation
- Center of Suzhou Nano Science and Technology
- Soochow University
| | - Jian-Mei Lu
- College of Chemistry
- Chemical Engineering and Materials Science
- Collaborative Innovation
- Center of Suzhou Nano Science and Technology
- Soochow University
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Zhang Y, Xue Z, Qi D, Wang K, Liu H, Jiang J. Mixed Phthalocyanine-Porphyrin Fused Conjugated Pentameric Nanoarrays. Chemistry 2017; 23:15017-15021. [PMID: 28929536 DOI: 10.1002/chem.201703787] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2017] [Indexed: 11/10/2022]
Abstract
The largest phthalocyanine-porphyrin-fused pentameric molecular arrays have been synthesized and spectroscopically characterized. The saddled molecular conformation revealed for the pentamer by DFT-D3 calculation in combination with the bulky peripheral substituents precludes effective face-to-face π-π intermolecular interaction. As a consequence, intermolecular C-H⋅⋅⋅π interactions together with the ubiquitous dispersion force arrays help to self-assemble the representative metal-free pentameric molecules into the three-dimensional supramolecular structures with nanorod morphology in CHCl3 and n-butanol. Powder X-ray diffraction (XRD) analysis and selected area electron diffraction (SAED) disclose the gradually increased long range of molecular ordering in the nanorods along with the increase in the substrate temperature from 30, 40, 50, to 60 °C. This in turn results in an increase in the semiconductivity of the single nanorod in the same order from 9.4×10-9 to 3.8×10-8 , 7.6×10-7 , and 6.3×10-5 S m-1 .
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Affiliation(s)
- Yuehong Zhang
- Beijing Key Laboratory for Science and Application of Functional Molecular and Crystalline Materials, Department of Chemistry, University of Science and Technology Beijing, Beijing, 100083, P. R. China
| | - Zheng Xue
- CAS Key Laboratory of Organic Solids, Beijing National Laboratory for Molecular Sciences (BNLMS), CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, P. R. China
| | - Dongdong Qi
- Beijing Key Laboratory for Science and Application of Functional Molecular and Crystalline Materials, Department of Chemistry, University of Science and Technology Beijing, Beijing, 100083, P. R. China
| | - Kang Wang
- Beijing Key Laboratory for Science and Application of Functional Molecular and Crystalline Materials, Department of Chemistry, University of Science and Technology Beijing, Beijing, 100083, P. R. China
| | - Huibiao Liu
- CAS Key Laboratory of Organic Solids, Beijing National Laboratory for Molecular Sciences (BNLMS), CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, P. R. China.,University of Chinese Academy of Sciences, Beijing, 100049, P. R. China
| | - Jianzhuang Jiang
- Beijing Key Laboratory for Science and Application of Functional Molecular and Crystalline Materials, Department of Chemistry, University of Science and Technology Beijing, Beijing, 100083, P. R. China
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Zhang Y, Xiu W, Sun Y, Zhu D, Zhang Q, Yuwen L, Weng L, Teng Z, Wang L. RGD-QD-MoS 2 nanosheets for targeted fluorescent imaging and photothermal therapy of cancer. NANOSCALE 2017; 9:15835-15845. [PMID: 28994430 DOI: 10.1039/c7nr05278b] [Citation(s) in RCA: 62] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
The fast-developing field of nanotechnology provides unprecedented opportunities for the increasing demands of biomedicine, especially for cancer diagnostics and treatment. Here, novel multifunctional zero-dimensional-two-dimensional (0D-2D) RGD-QD-MoS2 nanosheets (NSs) with excellent fluorescence, photothermal conversion, and cancer-targeting properties were successfully prepared by functionalizing single-layer MoS2 NSs with fluorescent quantum dots (QDs) and arginine-glycine-aspartic (RGD) containing peptides. By using RGD-QD-MoS2 NSs as a multifunctional theranostic agent, targeted fluorescent imaging and photothermal therapy (PTT) of human cervical carcinoma (HeLa) cells were achieved. Moreover, HeLa tumors in mouse models can be fluorescently imaged and completely eradicated by photothermal irradiation using a low power NIR laser, due to the effective accumulation of RGD-QD-MoS2 NSs at the tumor sites through the RGD-integrin targeting and the enhanced penetration and retention (EPR) effect. Without exhibiting any appreciable toxicity to treated cells or animals, RGD-QD-MoS2 NSs have been demonstrated as promising multifunctional theranostic agents for cancer imaging and therapy.
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Affiliation(s)
- Yuqian Zhang
- Key Laboratory for Organic Electronics and Information Displays & Institute of Advanced Materials (IAM), Jiangsu National Synergetic Innovation Centre for Advanced Materials (SICAM), Nanjing University of Posts & Telecommunications, 9 Wenyuan Road, Nanjing 210023, China.
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Tan C, Lai Z, Zhang H. Ultrathin Two-Dimensional Multinary Layered Metal Chalcogenide Nanomaterials. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2017; 29. [PMID: 28752578 DOI: 10.1002/adma.201701392] [Citation(s) in RCA: 117] [Impact Index Per Article: 16.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/11/2017] [Revised: 04/28/2017] [Indexed: 05/12/2023]
Abstract
Ultrathin two-dimensional (2D) layered transition metal dichalcogenides (TMDs), such as MoS2 , WS2 , TiS2 , TaS2 , ReS2 , MoSe2 and WSe2 , have attracted considerable attention over the past six years owing to their unique properties and great potential in a wide range of applications. Aiming to achieve tunable properties and optimal application performances, great effort is devoted to the exploration of 2D multinary layered metal chalcogenide nanomaterials, which include ternary metal chalcogenides with well-defined crystal structures, alloyed TMDs, heteroatom-doped TMDs and 2D metal chalcogenide heteronanostructures. These novel 2D multinary layered metal chalcogenide nanomaterials exhibit some unique properties compared to 2D binary TMD counterparts, thus holding great promise in various potential applications including electronics/optoelectronics, catalysis, sensors, biomedicine, and energy storage and conversion with enhanced performances. This article focuses on the state-of-art progress on the preparation, characterization and applications of ultrathin 2D multinary layered metal chalcogenide nanomaterials.
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Affiliation(s)
- Chaoliang Tan
- Center for Programmable Materials, School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore, 639798, Singapore
| | - Zhuangchai Lai
- Center for Programmable Materials, School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore, 639798, Singapore
| | - Hua Zhang
- Center for Programmable Materials, School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore, 639798, Singapore
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78
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79
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Garcia JH, Cummings AW, Roche S. Spin Hall Effect and Weak Antilocalization in Graphene/Transition Metal Dichalcogenide Heterostructures. NANO LETTERS 2017; 17:5078-5083. [PMID: 28715194 DOI: 10.1021/acs.nanolett.7b02364] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
We report on a theoretical study of the spin Hall Effect (SHE) and weak antilocalization (WAL) in graphene/transition metal dichalcogenide (TMDC) heterostructures, computed through efficient real-space quantum transport methods, and using realistic tight-binding models parametrized from ab initio calculations. The graphene/WS2 system is found to maximize spin proximity effects compared to graphene on MoS2, WSe2, or MoSe2 with a crucial role played by disorder, given the disappearance of SHE signals in the presence of strong intervalley scattering. Notably, we found that stronger WAL effects are concomitant with weaker charge-to-spin conversion efficiency. For further experimental studies of graphene/TMDC heterostructures, our findings provide guidelines for reaching the upper limit of spin current formation and for fully harvesting the potential of two-dimensional materials for spintronic applications.
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Affiliation(s)
- Jose H Garcia
- Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC and The Barcelona Institute of Science and Technology , Campus UAB, 08193 Barcelona, Spain
| | - Aron W Cummings
- Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC and The Barcelona Institute of Science and Technology , Campus UAB, 08193 Barcelona, Spain
| | - Stephan Roche
- Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC and The Barcelona Institute of Science and Technology , Campus UAB, 08193 Barcelona, Spain
- ICREA - Institució Catalana de Recerca i Estudis Avançats , 08010 Barcelona, Spain
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80
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Fan F, Zhang B, Cao Y, Yang X, Gu J, Chen Y. Conjugated polymer covalently modified graphene oxide quantum dots for ternary electronic memory devices. NANOSCALE 2017; 9:10610-10618. [PMID: 28726942 DOI: 10.1039/c7nr02809a] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/14/2023]
Abstract
Zero dimensional graphene oxide (GO) quantum dots (GOQDs) have been expected to play an important role in the development of new memory materials. When the size of GO was reduced to that of GOQDs, both the electron affinity and ionization potential of GO were found to be decreased, and this was followed by the elevation of lowest energy unoccupied molecular orbital (LUMO) energy level. This implies that the electron withdrawing ability of GOQDs is weaker than that of GO. In this work, a novel arylamine-based polyazomethine covalently functionalized graphene oxide quantum dots (TPAPAM-GOQDs), which was synthesized using an amidation reaction, was for the first time used to fabricate a ternary memory device with a configuration of gold/TPAPAM-GOQDs/indium tin oxide. The current ratio of OFF : ON-1 : ON-2 was found to be 1 : 60 : 3000. Its conductive nature was also revealed using an in situ conductive atomic force microscopy technique. This memory device could potentially increase the memory capacity of the device from the conventional 2n to 3n when compared to binary memory devices.
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Affiliation(s)
- Fei Fan
- Key Laboratory for Advanced Materials, Institute of Applied Chemistry, School of Chemistry and Molecular Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, China.
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81
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Han S, Hu L, Wang X, Zhou Y, Zeng Y, Ruan S, Pan C, Peng Z. Black Phosphorus Quantum Dots with Tunable Memory Properties and Multilevel Resistive Switching Characteristics. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2017; 4:1600435. [PMID: 28852609 PMCID: PMC5566243 DOI: 10.1002/advs.201600435] [Citation(s) in RCA: 53] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/03/2016] [Revised: 11/24/2016] [Indexed: 05/19/2023]
Abstract
Solution-processed black phosphorus quantum-dot-based resistive random access memory is demonstrated with tunable characteristics, multilevel data storage, and ultrahigh ON/OFF ratio. Effects of the black phosphorous quantum dots layer thickness and the compliance current setting on resistive switching behavior are systematically studied. Our devices can yield a series of SET voltages and current levels, hence having the potential for practical applications in the flexible electronics industry.
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Affiliation(s)
- Su‐Ting Han
- College of Optoelectronic EngineeringShenzhen UniversityShenzhen518060P. R. China
| | - Liang Hu
- Shenzhen Key Laboratory of Laser EngineeringCollege of Optoelectronic EngineeringShenzhen UniversityShenzhen518060P. R. China
| | - Xiandi Wang
- Beijing Institute of Nanoenergy and NanosystemsChinese Academy of SciencesBeijing100083P. R. China
| | - Ye Zhou
- Institute for Advanced StudyShenzhen UniversityShenzhen518060P. R. China
| | - Yu‐Jia Zeng
- Shenzhen Key Laboratory of Laser EngineeringCollege of Optoelectronic EngineeringShenzhen UniversityShenzhen518060P. R. China
| | - Shuangchen Ruan
- Shenzhen Key Laboratory of Laser EngineeringCollege of Optoelectronic EngineeringShenzhen UniversityShenzhen518060P. R. China
| | - Caofeng Pan
- Beijing Institute of Nanoenergy and NanosystemsChinese Academy of SciencesBeijing100083P. R. China
| | - Zhengchun Peng
- College of Optoelectronic EngineeringShenzhen UniversityShenzhen518060P. R. China
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82
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Li H, Li Y, Aljarb A, Shi Y, Li LJ. Epitaxial Growth of Two-Dimensional Layered Transition-Metal Dichalcogenides: Growth Mechanism, Controllability, and Scalability. Chem Rev 2017; 118:6134-6150. [DOI: 10.1021/acs.chemrev.7b00212] [Citation(s) in RCA: 225] [Impact Index Per Article: 32.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Henan Li
- College of Electronic Science and Technology, Shenzhen University, Shenzhen 518060, China
| | - Ying Li
- SZU-NUS Collaborative Innovation Center for Optoelectronic Science & Technology, International Collaborative Laboratory of 2D Materials for Optoelectronics Science and Technology, College of Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China
| | - Areej Aljarb
- Physical Sciences and Engineering Division, King Abdullah University of Science and Technology, Thuwal 23955-6900, Saudi Arabia
| | - Yumeng Shi
- SZU-NUS Collaborative Innovation Center for Optoelectronic Science & Technology, International Collaborative Laboratory of 2D Materials for Optoelectronics Science and Technology, College of Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China
| | - Lain-Jong Li
- Physical Sciences and Engineering Division, King Abdullah University of Science and Technology, Thuwal 23955-6900, Saudi Arabia
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83
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De Sanctis A, Jones GF, Townsend NJ, Craciun MF, Russo S. An integrated and multi-purpose microscope for the characterization of atomically thin optoelectronic devices. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2017; 88:055102. [PMID: 28571447 DOI: 10.1063/1.4982358] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
Optoelectronic devices based on graphene and other two-dimensional (2D) materials, such as transition metal dichalcogenides (TMDs), are the focus of wide research interest. They can be the key to improving bandwidths in telecommunications, capacity in data storage, and new features in consumer electronics, safety devices, and medical equipment. The characterization of these emerging atomically thin materials and devices strongly relies on a set of measurements involving both optical and electronic instrumentation ranging from scanning photocurrent mapping to Raman and photoluminescence (PL) spectroscopy. Furthermore, proof-of-concept devices are usually fabricated from micro-meter size flakes, requiring microscopy techniques to characterize them. Current state-of-the-art commercial instruments offer the ability to characterize individual properties of these materials with no option for the in situ characterization of a wide enough range of complementary optical and electrical properties. Presently, the requirement to switch atomically thin materials from one system to another often radically affects the properties of these uniquely sensitive materials through atmospheric contamination. Here, we present an integrated, multi-purpose instrument dedicated to the optical and electrical characterization of devices based on 2D materials which is able to perform low frequency electrical measurements, scanning photocurrent mapping, and Raman, absorption, and PL spectroscopy in one single setup with full control over the polarization and wavelength of light. We characterize this apparatus by performing multiple measurements on graphene, transition metal dichalcogenides (TMDs), and Si. The performance and resolution of each individual measurement technique is found to be equivalent to that of commercially available instruments. Contrary to nowadays' commercial systems, a significant advantage of the developed instrument is that for the first time the integration of a wide range of complementary optoelectronic and spectroscopy characterization techniques is demonstrated in a single compact unit. Our design offers a versatile solution to face the challenges imposed by the advent of atomically thin materials in optoelectronic devices.
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Affiliation(s)
- Adolfo De Sanctis
- Centre for Graphene Science, College of Engineering, Mathematics and Physical Sciences, University of Exeter, Exeter EX4 4QF, United Kingdom
| | - Gareth F Jones
- Centre for Graphene Science, College of Engineering, Mathematics and Physical Sciences, University of Exeter, Exeter EX4 4QF, United Kingdom
| | - Nicola J Townsend
- Centre for Graphene Science, College of Engineering, Mathematics and Physical Sciences, University of Exeter, Exeter EX4 4QF, United Kingdom
| | - Monica F Craciun
- Centre for Graphene Science, College of Engineering, Mathematics and Physical Sciences, University of Exeter, Exeter EX4 4QF, United Kingdom
| | - Saverio Russo
- Centre for Graphene Science, College of Engineering, Mathematics and Physical Sciences, University of Exeter, Exeter EX4 4QF, United Kingdom
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84
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Kim RH, Lee J, Kim KL, Cho SM, Kim DH, Park C. Flexible Nonvolatile Transistor Memory with Solution-Processed Transition Metal Dichalcogenides. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2017; 13. [PMID: 28371305 DOI: 10.1002/smll.201603971] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/27/2016] [Revised: 01/23/2017] [Indexed: 05/11/2023]
Abstract
Nonvolatile field-effect transistor (FET) memories containing transition metal dichalcogenide (TMD) nanosheets have been recently developed with great interest by utilizing some of the intriguing photoelectronic properties of TMDs. The TMD nanosheets are, however, employed as semiconducting channels in most of the memories, and only a few works address their function as floating gates. Here, a floating-gate organic-FET memory with an all-in-one floating-gate/tunneling layer of the solution-processed TMD nanosheets is demonstrated. Molybdenum disulfide (MoS2 ) is efficiently liquid-exfoliated by amine-terminated polystyrene with a controlled amount of MoS2 nanosheets in an all-in-one floating-gate/tunneling layer, allowing for systematic investigation of concentration-dependent charge-trapping and detrapping properties of MoS2 nanosheets. At an optimized condition, the nonvolatile memory exhibits memory performances with an ON/OFF ratio greater than 104 , a program/erase endurance cycle over 400 times, and data retention longer than 7 × 103 s. All-in-one floating-gate/tunneling layers containing molybdenum diselenide and tungsten disulfide are also developed. Furthermore, a mechanically-flexible TMD memory on a plastic substrate shows a performance comparable with that on a hard substrate, and the memory properties are rarely altered after outer-bending events over 500 times at the bending radius of 4.0 mm.
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Affiliation(s)
- Richard Hahnkee Kim
- Department of Materials Science and Engineering, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul, 120-749, Republic of Korea
| | - Jinseong Lee
- Department of Materials Science and Engineering, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul, 120-749, Republic of Korea
| | - Kang Lib Kim
- Department of Materials Science and Engineering, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul, 120-749, Republic of Korea
| | - Suk Man Cho
- Department of Materials Science and Engineering, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul, 120-749, Republic of Korea
| | - Dong Ha Kim
- Department of Chemistry and Nano Science, Division of Molecular and Life Sciences, College of Natural Sciences, Ewha Womans University, 52, Ewhayeodae-gil, Seodaemun-gu, Seoul, 03760, Republic of Korea
| | - Cheolmin Park
- Department of Materials Science and Engineering, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul, 120-749, Republic of Korea
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85
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Wu X, Li H, Liu H, Zhuang X, Wang X, Fan X, Duan X, Zhu X, Zhang Q, Meixner AJ, Duan X, Pan A. Spatially composition-modulated two-dimensional WS 2xSe 2(1-x) nanosheets. NANOSCALE 2017; 9:4707-4712. [PMID: 28327743 DOI: 10.1039/c7nr00272f] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Controllable synthesis of two-dimensional (2D) transition-metal dichalcogenides (TMDs) with tunable bandgaps is vital for their applications in nanophotonics, due to its efficient modulation of the physical and chemical properties of these atomic layered nanostructures. Here we report for the first time, the controllable synthesis of spatially composition-modulated WS2xSe2(1-x) nanosheets and WS2-WS2xSe2(1-x) lateral heterostructures by a developed one-step chemical vapor deposition (CVD) approach, as well as the understanding of their growth mechanism. During the growth, the composition was optically tuned along the plane of the atomic layered nanosheets through the precise control of evaporation sources. Microstructure characterization confirms the chemical identity of the composition modulated nanosheets, with S and Se contents gradually converting from the center to the edge. Local photoluminescence (PL) and Raman studies further demonstrate the position-dependent optical properties of the as-grown nanosheets, with the PL peak and Raman modes shifting in a wide range along the whole plane of the nanostructures, which are consistent with their tunable compositions and bandgaps. This demonstration of composition-modulated nanostructures provides a beneficial approach for the preparation of 2D semiconductor heterostructures and may open up a wide range of applications in nanoelectronics and optoelectronics.
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Affiliation(s)
- Xueping Wu
- Key Laboratory for Micro-Nano Physics and Technology of Hunan Province, School of Physics and Electronic Science, and State Key Laboratory of Chemo/Biosensing and Chemometrics, Hunan University, Changsha, Hunan 410082, P. R. China.
| | - Honglai Li
- Key Laboratory for Micro-Nano Physics and Technology of Hunan Province, School of Physics and Electronic Science, and State Key Laboratory of Chemo/Biosensing and Chemometrics, Hunan University, Changsha, Hunan 410082, P. R. China.
| | - Hongjun Liu
- Key Laboratory for Micro-Nano Physics and Technology of Hunan Province, School of Physics and Electronic Science, and State Key Laboratory of Chemo/Biosensing and Chemometrics, Hunan University, Changsha, Hunan 410082, P. R. China.
| | - Xiujuan Zhuang
- Key Laboratory for Micro-Nano Physics and Technology of Hunan Province, School of Physics and Electronic Science, and State Key Laboratory of Chemo/Biosensing and Chemometrics, Hunan University, Changsha, Hunan 410082, P. R. China.
| | - Xiao Wang
- Key Laboratory for Micro-Nano Physics and Technology of Hunan Province, School of Physics and Electronic Science, and State Key Laboratory of Chemo/Biosensing and Chemometrics, Hunan University, Changsha, Hunan 410082, P. R. China. and Institute of Physical and Theoretical Chemistry and LISA+, University of Tübingen, Auf der Morgenstelle 18, 72076 Tübingen, Germany
| | - Xiaopeng Fan
- Key Laboratory for Micro-Nano Physics and Technology of Hunan Province, School of Physics and Electronic Science, and State Key Laboratory of Chemo/Biosensing and Chemometrics, Hunan University, Changsha, Hunan 410082, P. R. China.
| | - Xidong Duan
- Key Laboratory for Micro-Nano Physics and Technology of Hunan Province, School of Physics and Electronic Science, and State Key Laboratory of Chemo/Biosensing and Chemometrics, Hunan University, Changsha, Hunan 410082, P. R. China.
| | - Xiaoli Zhu
- Key Laboratory for Micro-Nano Physics and Technology of Hunan Province, School of Physics and Electronic Science, and State Key Laboratory of Chemo/Biosensing and Chemometrics, Hunan University, Changsha, Hunan 410082, P. R. China.
| | - Qinglin Zhang
- Key Laboratory for Micro-Nano Physics and Technology of Hunan Province, School of Physics and Electronic Science, and State Key Laboratory of Chemo/Biosensing and Chemometrics, Hunan University, Changsha, Hunan 410082, P. R. China.
| | - Alfred J Meixner
- Institute of Physical and Theoretical Chemistry and LISA+, University of Tübingen, Auf der Morgenstelle 18, 72076 Tübingen, Germany
| | - Xiangfeng Duan
- Department of Chemistry and Biochemistry, University of California, Los Angeles, CA 90095, USA
| | - Anlian Pan
- Key Laboratory for Micro-Nano Physics and Technology of Hunan Province, School of Physics and Electronic Science, and State Key Laboratory of Chemo/Biosensing and Chemometrics, Hunan University, Changsha, Hunan 410082, P. R. China.
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86
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Nagareddy VK, Barnes MD, Zipoli F, Lai KT, Alexeev AM, Craciun MF, Wright CD. Multilevel Ultrafast Flexible Nanoscale Nonvolatile Hybrid Graphene Oxide-Titanium Oxide Memories. ACS NANO 2017; 11:3010-3021. [PMID: 28221755 DOI: 10.1021/acsnano.6b08668] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Graphene oxide (GO) resistive memories offer the promise of low-cost environmentally sustainable fabrication, high mechanical flexibility and high optical transparency, making them ideally suited to future flexible and transparent electronics applications. However, the dimensional and temporal scalability of GO memories, i.e., how small they can be made and how fast they can be switched, is an area that has received scant attention. Moreover, a plethora of GO resistive switching characteristics and mechanisms has been reported in the literature, sometimes leading to a confusing and conflicting picture. Consequently, the potential for graphene oxide to deliver high-performance memories operating on nanometer length and nanosecond time scales is currently unknown. Here we address such shortcomings, presenting not only the smallest (50 nm), fastest (sub-5 ns), thinnest (8 nm) GO-based memory devices produced to date, but also demonstrate that our approach provides easily accessible multilevel (4-level, 2-bit per cell) storage capabilities along with excellent endurance and retention performance-all on both rigid and flexible substrates. Via comprehensive experimental characterizations backed-up by detailed atomistic simulations, we also show that the resistive switching mechanism in our Pt/GO/Ti/Pt devices is driven by redox reactions in the interfacial region between the top (Ti) electrode and the GO layer.
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Affiliation(s)
- V Karthik Nagareddy
- Centre for Graphene Science, College of Engineering, Mathematics and Physical Sciences, University of Exeter , Harrison Building, North Park Road, Exeter EX4 4QF, U.K
| | - Matthew D Barnes
- Centre for Graphene Science, College of Engineering, Mathematics and Physical Sciences, University of Exeter , Harrison Building, North Park Road, Exeter EX4 4QF, U.K
| | - Federico Zipoli
- IBM Research-Zurich , Säumerstrasse 4, 8803 Rüuschlikon, Switzerland
| | - Khue T Lai
- Centre for Graphene Science, College of Engineering, Mathematics and Physical Sciences, University of Exeter , Harrison Building, North Park Road, Exeter EX4 4QF, U.K
| | - Arseny M Alexeev
- Centre for Graphene Science, College of Engineering, Mathematics and Physical Sciences, University of Exeter , Harrison Building, North Park Road, Exeter EX4 4QF, U.K
| | - Monica Felicia Craciun
- Centre for Graphene Science, College of Engineering, Mathematics and Physical Sciences, University of Exeter , Harrison Building, North Park Road, Exeter EX4 4QF, U.K
| | - C David Wright
- Centre for Graphene Science, College of Engineering, Mathematics and Physical Sciences, University of Exeter , Harrison Building, North Park Road, Exeter EX4 4QF, U.K
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87
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Li Y, Liu Z, Li H, Xu Q, He J, Lu J. Fluorine-Induced Highly Reproducible Resistive Switching Performance: Facile Morphology Control through the Transition between J- and H-Aggregation. ACS APPLIED MATERIALS & INTERFACES 2017; 9:9926-9934. [PMID: 28247757 DOI: 10.1021/acsami.7b01128] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Improving the reproducibility and air-endurance of organic resistance switching (RS) devices, in particular multilevel-cell RS devices, is critical for the confirmation of its competency to realize big data storage capability. However, such enhancement still remains challenging. In this report, we demonstrated that fluorine (F)-embedding should be an effective way to enhance the overall performance of RS devices. Four new azo-cored analogues (IDAZO, FIDAZO, F2IDAZO, and F4IDAZO) have been designed and synthesized. These four compounds have similar structures with different numbers of F substituents. Interestingly, UV-vis measurements reveal that upon F-embedding, an exceptional transition from molecular J-aggregation to H-aggregation is achieved. As a result, the morphology of RS films becomes more and more uniform, as determined by AFM and XRD. Meanwhile, the hydrophobicity of RS film is promoted, which further improves the device atmospheric stability. The total RS reproducibility increases to 96% (the uppermost value), and the tristage RS reproducibility rises to 64%, accompanied by a more stable OFF state and lower logic SET voltages. Our study suggests F-embedding would be a promising strategy to achieve highly reproducible and air-endurable organic multilevel-cell RS devices.
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Affiliation(s)
- Yang Li
- College of Chemistry, Chemical Engineering and Materials Science, Soochow University , Suzhou 215123, P. R. China
- School of Materials Science and Engineering, Nanyang Technological University , Singapore 639798, Singapore
| | - Zhaojun Liu
- College of Chemistry, Chemical Engineering and Materials Science, Soochow University , Suzhou 215123, P. R. China
| | - Hua Li
- College of Chemistry, Chemical Engineering and Materials Science, Soochow University , Suzhou 215123, P. R. China
| | - Qingfeng Xu
- College of Chemistry, Chemical Engineering and Materials Science, Soochow University , Suzhou 215123, P. R. China
| | - Jinghui He
- College of Chemistry, Chemical Engineering and Materials Science, Soochow University , Suzhou 215123, P. R. China
| | - Jianmei Lu
- College of Chemistry, Chemical Engineering and Materials Science, Soochow University , Suzhou 215123, P. R. China
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88
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Tan C, Cao X, Wu XJ, He Q, Yang J, Zhang X, Chen J, Zhao W, Han S, Nam GH, Sindoro M, Zhang H. Recent Advances in Ultrathin Two-Dimensional Nanomaterials. Chem Rev 2017; 117:6225-6331. [PMID: 28306244 DOI: 10.1021/acs.chemrev.6b00558] [Citation(s) in RCA: 1941] [Impact Index Per Article: 277.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
Since the discovery of mechanically exfoliated graphene in 2004, research on ultrathin two-dimensional (2D) nanomaterials has grown exponentially in the fields of condensed matter physics, material science, chemistry, and nanotechnology. Highlighting their compelling physical, chemical, electronic, and optical properties, as well as their various potential applications, in this Review, we summarize the state-of-art progress on the ultrathin 2D nanomaterials with a particular emphasis on their recent advances. First, we introduce the unique advances on ultrathin 2D nanomaterials, followed by the description of their composition and crystal structures. The assortments of their synthetic methods are then summarized, including insights on their advantages and limitations, alongside some recommendations on suitable characterization techniques. We also discuss in detail the utilization of these ultrathin 2D nanomaterials for wide ranges of potential applications among the electronics/optoelectronics, electrocatalysis, batteries, supercapacitors, solar cells, photocatalysis, and sensing platforms. Finally, the challenges and outlooks in this promising field are featured on the basis of its current development.
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Affiliation(s)
- Chaoliang Tan
- Center for Programmable Materials, School of Materials Science and Engineering, Nanyang Technological University , 50 Nanyang Avenue, Singapore 639798, Singapore
| | - Xiehong Cao
- Center for Programmable Materials, School of Materials Science and Engineering, Nanyang Technological University , 50 Nanyang Avenue, Singapore 639798, Singapore.,College of Materials Science and Engineering, Zhejiang University of Technology , 18 Chaowang Road, Hangzhou 310014, China
| | - Xue-Jun Wu
- Center for Programmable Materials, School of Materials Science and Engineering, Nanyang Technological University , 50 Nanyang Avenue, Singapore 639798, Singapore
| | - Qiyuan He
- Center for Programmable Materials, School of Materials Science and Engineering, Nanyang Technological University , 50 Nanyang Avenue, Singapore 639798, Singapore
| | - Jian Yang
- Center for Programmable Materials, School of Materials Science and Engineering, Nanyang Technological University , 50 Nanyang Avenue, Singapore 639798, Singapore
| | - Xiao Zhang
- Center for Programmable Materials, School of Materials Science and Engineering, Nanyang Technological University , 50 Nanyang Avenue, Singapore 639798, Singapore
| | - Junze Chen
- Center for Programmable Materials, School of Materials Science and Engineering, Nanyang Technological University , 50 Nanyang Avenue, Singapore 639798, Singapore
| | - Wei Zhao
- Center for Programmable Materials, School of Materials Science and Engineering, Nanyang Technological University , 50 Nanyang Avenue, Singapore 639798, Singapore
| | - Shikui Han
- Center for Programmable Materials, School of Materials Science and Engineering, Nanyang Technological University , 50 Nanyang Avenue, Singapore 639798, Singapore
| | - Gwang-Hyeon Nam
- Center for Programmable Materials, School of Materials Science and Engineering, Nanyang Technological University , 50 Nanyang Avenue, Singapore 639798, Singapore
| | - Melinda Sindoro
- Center for Programmable Materials, School of Materials Science and Engineering, Nanyang Technological University , 50 Nanyang Avenue, Singapore 639798, Singapore
| | - Hua Zhang
- Center for Programmable Materials, School of Materials Science and Engineering, Nanyang Technological University , 50 Nanyang Avenue, Singapore 639798, Singapore
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89
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Chen Y, Wu Y, Sun B, Liu S, Liu H. Two-Dimensional Nanomaterials for Cancer Nanotheranostics. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2017; 13:1603446. [PMID: 28075057 DOI: 10.1002/smll.201603446] [Citation(s) in RCA: 98] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/14/2016] [Revised: 11/27/2016] [Indexed: 06/06/2023]
Abstract
Emerging nanotechnologies show unprecedented advantages in accelerating cancer theranostics. Among them, two-dimensional nanomaterials (2DNMs) represent a novel type of material with versatile physicochemical properties that have enabled a new horizon for applications in both cancer diagnosis and therapy. Studies have demonstrated that 2DNMs may be used in diverse aspects, including i) cancer detection due to their high propensity towards tumor markers; ii) molecular imaging for guided tumor therapies, and iii) drug and gene loading, photothermal and photodynamic cancer therapies. However, their biomedical applications raise concerns due to the limited understanding of their in vivo metabolism, transformation and possible toxicities. In this comprehensive review, the state-of-the-art development of 2DNMs and their implications for cancer nanotheranostics are presented. The modification strategies to enhance the biocompatibility of 2DNMs are also reviewed.
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Affiliation(s)
- Yongjiu Chen
- State Key Laboratory of Environmental, Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China
| | - Yakun Wu
- State Key Laboratory of Environmental, Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China
| | - Bingbing Sun
- School of Chemical Engineering, Dalian University of Technology, Dalian, 116024, China
| | - Sijin Liu
- State Key Laboratory of Environmental, Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China
| | - Huiyu Liu
- Beijing Key Laboratory of Bioprocess, Beijing Advanced Innovation Center for Soft Matter Science and Engineering, Beijing Laboratory of Biomedical Materials, Beijing University of Chemical Technology, Beijing, 100029, China
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90
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Qian K, Tay RY, Lin MF, Chen J, Li H, Lin J, Wang J, Cai G, Nguyen VC, Teo EHT, Chen T, Lee PS. Direct Observation of Indium Conductive Filaments in Transparent, Flexible, and Transferable Resistive Switching Memory. ACS NANO 2017; 11:1712-1718. [PMID: 28112907 DOI: 10.1021/acsnano.6b07577] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Electronics with multifunctionalities such as transparency, portability, and flexibility are anticipated for future circuitry development. Flexible memory is one of the indispensable elements in a hybrid electronic integrated circuit as the information storage device. Herein, we demonstrate a transparent, flexible, and transferable hexagonal boron nitride (hBN)-based resistive switching memory with indium tin oxide (ITO) and graphene electrodes on soft polydimethylsiloxane (PDMS) substrate. The ITO/hBN/graphene/PDMS memory device not only exhibits excellent performance in terms of optical transmittance (∼85% in the visible wavelength), ON/OFF ratio (∼480), retention time (∼5 × 104 s) but also shows robust flexibility under bending conditions and stable operation on arbitrary substrates. More importantly, direct observation of indium filaments in an ITO/hBN/graphene device is found via ex situ transmission electron microscopy, which provides critical insight on the complex resistive switching mechanisms.
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Affiliation(s)
- Kai Qian
- School of Materials Science and Engineering, and ‡School of Electrical and Electronic Engineering, Nanyang Technological University , 50 Nanyang Avenue, 639798, Singapore
| | - Roland Yingjie Tay
- School of Materials Science and Engineering, and ‡School of Electrical and Electronic Engineering, Nanyang Technological University , 50 Nanyang Avenue, 639798, Singapore
| | - Meng-Fang Lin
- School of Materials Science and Engineering, and ‡School of Electrical and Electronic Engineering, Nanyang Technological University , 50 Nanyang Avenue, 639798, Singapore
| | - Jingwei Chen
- School of Materials Science and Engineering, and ‡School of Electrical and Electronic Engineering, Nanyang Technological University , 50 Nanyang Avenue, 639798, Singapore
| | - Huakai Li
- School of Materials Science and Engineering, and ‡School of Electrical and Electronic Engineering, Nanyang Technological University , 50 Nanyang Avenue, 639798, Singapore
| | - Jinjun Lin
- School of Materials Science and Engineering, and ‡School of Electrical and Electronic Engineering, Nanyang Technological University , 50 Nanyang Avenue, 639798, Singapore
| | - Jiangxin Wang
- School of Materials Science and Engineering, and ‡School of Electrical and Electronic Engineering, Nanyang Technological University , 50 Nanyang Avenue, 639798, Singapore
| | - Guofa Cai
- School of Materials Science and Engineering, and ‡School of Electrical and Electronic Engineering, Nanyang Technological University , 50 Nanyang Avenue, 639798, Singapore
| | - Viet Cuong Nguyen
- School of Materials Science and Engineering, and ‡School of Electrical and Electronic Engineering, Nanyang Technological University , 50 Nanyang Avenue, 639798, Singapore
| | - Edwin Hang Tong Teo
- School of Materials Science and Engineering, and ‡School of Electrical and Electronic Engineering, Nanyang Technological University , 50 Nanyang Avenue, 639798, Singapore
| | - Tupei Chen
- School of Materials Science and Engineering, and ‡School of Electrical and Electronic Engineering, Nanyang Technological University , 50 Nanyang Avenue, 639798, Singapore
| | - Pooi See Lee
- School of Materials Science and Engineering, and ‡School of Electrical and Electronic Engineering, Nanyang Technological University , 50 Nanyang Avenue, 639798, Singapore
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91
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Fan F, Zhang B, Cao Y, Chen Y. Solution-processable poly(N-vinylcarbazole)-covalently grafted MoS 2 nanosheets for nonvolatile rewritable memory devices. NANOSCALE 2017; 9:2449-2456. [PMID: 28177014 DOI: 10.1039/c6nr09241a] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
A novel nonvolatile rewritable memory device based on the soluble poly(N-vinylcarbazole)-chemically modified MoS2 nanosheets (MoS2-PVK) was fabricated with the configuration of Au/MoS2-PVK/ITO. This is the first example of polymer covalently modified MoS2 nanosheet-based memory devices. As expected, this device exhibited a typical storage performance of nonvolatile rewritable memory, with a turn-on voltage of -1.54 V and an ON/OFF current ratio of 4 × 102. After annealing at 80 °C for 1 h under a nitrogen atmosphere, a high ON/OFF current ratio (up to 3 × 104) and a lower turn-on voltage (-1.31 V), which are among the best reported for MoS2-based polymer/organic memory devices, were achieved due to enhanced crystallization of PVK, which induced a more efficient intramolecular charge transfer effect between PVK and MoS2 during the annealing process. The effect of film thickness on the current-voltage characteristics of the MoS2-PVK-based devices and the memory performance of the MoS2/PVK blends-based devices have also been explored.
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Affiliation(s)
- Fei Fan
- Key Laboratory for Advanced Materials, Institute of Applied Chemistry, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, China.
| | - Bin Zhang
- Key Laboratory for Advanced Materials, Institute of Applied Chemistry, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, China.
| | - Yaming Cao
- Key Laboratory for Advanced Materials, Institute of Applied Chemistry, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, China.
| | - Yu Chen
- Key Laboratory for Advanced Materials, Institute of Applied Chemistry, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, China.
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92
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Li X, Shan J, Zhang W, Su S, Yuwen L, Wang L. Recent Advances in Synthesis and Biomedical Applications of Two-Dimensional Transition Metal Dichalcogenide Nanosheets. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2017; 13:1602660. [PMID: 27982538 DOI: 10.1002/smll.201602660] [Citation(s) in RCA: 140] [Impact Index Per Article: 20.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/10/2016] [Revised: 10/23/2016] [Indexed: 06/06/2023]
Abstract
During recent decades, a giant leap in the development of nanotechnology has been witnessed. Numerous nanomaterials with different dimensions and unprecedented features have been developed and provided unimaginably wide scope to solve the challenging problems in biomedicine, such as cancer diagnosis and therapy. Recently, two-dimensional (2D) transition metal dichalcogenide (TMDC) nanosheets (NSs), including MoS2 , WS2 , and etc., have emerged as novel inorganic graphene analogues and attracted tremendous attention due to their unique structures and distinctive properties, and opened up great opportunities for biomedical applications, including ultrasensitive biosensing, biological imaging, drug delivery, cancer therapy, and antibacterial treatment. A comprehensive overview of different synthetic methods of ultrathin 2D TMDC NSs and their state-of-the-art biomedical applications, especially those that have appeared in the past few years, is presented. At the end of this review, the future opportunities and challenges for 2D TMDC NSs in biomedicine are also discussed.
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Affiliation(s)
- Xiao Li
- Key Laboratory for Organic Electronics and Information Displays & Institute of Advanced Materials (IAM), Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM), Nanjing University of Posts & Telecommunications, Nanjing, 210023, China
| | - Jingyang Shan
- Key Laboratory for Organic Electronics and Information Displays & Institute of Advanced Materials (IAM), Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM), Nanjing University of Posts & Telecommunications, Nanjing, 210023, China
| | - Weizhen Zhang
- Key Laboratory for Organic Electronics and Information Displays & Institute of Advanced Materials (IAM), Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM), Nanjing University of Posts & Telecommunications, Nanjing, 210023, China
| | - Shao Su
- Key Laboratory for Organic Electronics and Information Displays & Institute of Advanced Materials (IAM), Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM), Nanjing University of Posts & Telecommunications, Nanjing, 210023, China
| | - Lihui Yuwen
- Key Laboratory for Organic Electronics and Information Displays & Institute of Advanced Materials (IAM), Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM), Nanjing University of Posts & Telecommunications, Nanjing, 210023, China
| | - Lianhui Wang
- Key Laboratory for Organic Electronics and Information Displays & Institute of Advanced Materials (IAM), Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM), Nanjing University of Posts & Telecommunications, Nanjing, 210023, China
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93
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Yen HJ, Shan C, Wang L, Xu P, Zhou M, Wang HL. Development of Conjugated Polymers for Memory Device Applications. Polymers (Basel) 2017; 9:E25. [PMID: 30970701 PMCID: PMC6432021 DOI: 10.3390/polym9010025] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2016] [Revised: 12/27/2016] [Accepted: 01/08/2017] [Indexed: 11/26/2022] Open
Abstract
This review summarizes the most widely used mechanisms in memory devices based on conjugated polymers, such as charge transfer, space charge traps, and filament conduction. In addition, recent studies of conjugated polymers for memory device applications are also reviewed, discussed, and differentiated based on the mechanisms and structural design. Moreover, the electrical conditions of conjugated polymers can be further fine-tuned by careful design and synthesis based on the switching mechanisms. The review also emphasizes and demonstrates the structure-memory properties relationship of donor-acceptor conjugated polymers for advanced memory device applications.
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Affiliation(s)
- Hung-Ju Yen
- Physical Chemistry and Applied Spectroscopy (C-PCS), Chemistry Division, Los Alamos National Laboratory, Los Alamos, NM 87545, USA.
| | - Changsheng Shan
- Physical Chemistry and Applied Spectroscopy (C-PCS), Chemistry Division, Los Alamos National Laboratory, Los Alamos, NM 87545, USA.
| | - Leeyih Wang
- Center for Condensed Matter Science, National Taiwan University, 1 Roosevelt Road, 4th Sec., Taipei 10617, Taiwan.
| | - Ping Xu
- School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150001, China.
| | - Ming Zhou
- Department of Chemistry, Northeast Normal University, Changchun 130024, China.
| | - Hsing-Lin Wang
- Physical Chemistry and Applied Spectroscopy (C-PCS), Chemistry Division, Los Alamos National Laboratory, Los Alamos, NM 87545, USA.
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94
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Ravi B, Chakraborty S, Bhattacharjee M, Mitra S, Ghosh A, Gooh Pattader PS, Bandyopadhyay D. Pattern-Directed Ordering of Spin-Dewetted Liquid Crystal Micro- or Nanodroplets as Pixelated Light Reflectors and Locomotives. ACS APPLIED MATERIALS & INTERFACES 2017; 9:1066-1076. [PMID: 28026170 DOI: 10.1021/acsami.6b12182] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Chemical pattern directed spin-dewetting of a macroscopic droplet composed of a dilute organic solution of liquid crystal (LC) formed an ordered array of micro- and nanoscale LC droplets. Controlled evaporation of the spin-dewetted droplets through vacuum drying could further miniaturize the size to the level of ∼90 nm. The size, periodicity, and spacing of these mesoscale droplets could be tuned with the variations in the initial loading of LC in the organic solution, the strength of the centripetal force on the droplet, and the duration of the evaporation. A simple theoretical model was developed to predict the spacing between the spin-dewetted droplets. The patterned LC droplets showed a reversible phase transition from nematic to isotropic and vice versa with the periodic exposure of a solvent vapor and its removal. A similar phase transition behavior was also observed with the periodic increase or reduction of temperature, suggesting their usefulness as vapor or temperature sensors. Interestingly, when the spin-dewetted droplets were confined between a pair of electrodes and an external electric field was applied, the droplets situated at the hydrophobic patches showed light-reflecting properties under the polarization microscopy highlighting their importance in the development of micro- or nanoscale LC displays. The digitized LC droplets, which were stationary otherwise, showed dielectrophoretic locomotion under the guidance of the external electric field beyond a threshold intensity of the field. Remarkably, the motion of these droplets could be restricted to the hydrophilic zones, which were confined between the hydrophobic patches of the chemically patterned surface. The findings could significantly contribute in the development of futuristic vapor or temperature sensors, light reflectors, and self-propellers using the micro- or nanoscale digitized LC droplets.
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Affiliation(s)
- Bolleddu Ravi
- Department of Chemical Engineering, Indian Institute of Technology Guwahati , Guwahati, Assam 781039, India
| | - Snigdha Chakraborty
- Department of Chemical Engineering, Indian Institute of Technology Guwahati , Guwahati, Assam 781039, India
| | - Mitradip Bhattacharjee
- Centre for Nanotechnology, Indian Institute of Technology Guwahati , Guwahati, Assam 781039, India
| | - Shirsendu Mitra
- Department of Chemical Engineering, Indian Institute of Technology Guwahati , Guwahati, Assam 781039, India
| | - Abir Ghosh
- Department of Chemical Engineering, Indian Institute of Technology Kanpur , Kanpur, Uttar Pradesh 208016, India
| | - Partho Sarathi Gooh Pattader
- Department of Chemical Engineering, Indian Institute of Technology Guwahati , Guwahati, Assam 781039, India
- Centre for Nanotechnology, Indian Institute of Technology Guwahati , Guwahati, Assam 781039, India
| | - Dipankar Bandyopadhyay
- Department of Chemical Engineering, Indian Institute of Technology Guwahati , Guwahati, Assam 781039, India
- Centre for Nanotechnology, Indian Institute of Technology Guwahati , Guwahati, Assam 781039, India
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95
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Zhao F, Wang L, Zhao Y, Qu L, Dai L. Graphene Oxide Nanoribbon Assembly toward Moisture-Powered Information Storage. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2017; 29. [PMID: 27862418 DOI: 10.1002/adma.201604972] [Citation(s) in RCA: 57] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/15/2016] [Indexed: 05/16/2023]
Abstract
Moisture-powered potential switching is achieved by establishing ion channels and an oxygen-functional-group gradient in graphene oxide nanoribbon network assemblies. The resulting flexible membrane is used to fabricate breath-powered write-once-read-many-times-type memory devices with a remarkably low error risk (ON/OFF ratio of 106 ), and long-term stability for reading out with human breath.
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Affiliation(s)
- Fei Zhao
- Beijing Key Laboratory of Photoelectronic/Electrophotonic Conversion Materials, Key Laboratory of Cluster Science, Ministry of Education, School of Chemistry, Beijing Institute of Technology, Beijing, 100081, P. R. China
| | - Lixia Wang
- Beijing Key Laboratory of Photoelectronic/Electrophotonic Conversion Materials, Key Laboratory of Cluster Science, Ministry of Education, School of Chemistry, Beijing Institute of Technology, Beijing, 100081, P. R. China
| | - Yang Zhao
- Beijing Key Laboratory of Photoelectronic/Electrophotonic Conversion Materials, Key Laboratory of Cluster Science, Ministry of Education, School of Chemistry, Beijing Institute of Technology, Beijing, 100081, P. R. China
| | - Liangti Qu
- Beijing Key Laboratory of Photoelectronic/Electrophotonic Conversion Materials, Key Laboratory of Cluster Science, Ministry of Education, School of Chemistry, Beijing Institute of Technology, Beijing, 100081, P. R. China
| | - Liming Dai
- Center of Advanced Science and Engineering for Carbon (Case 4Carbon), Department of Macromolecular Science Engineering, Case School of Engineering, Case Western Reserve University, 10900 Euclid Avenue, Cleveland, OH, 44106, USA
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96
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Kaur J, Gravagnuolo AM, Maddalena P, Altucci C, Giardina P, Gesuele F. Green synthesis of luminescent and defect-free bio-nanosheets of MoS2: interfacing two-dimensional crystals with hydrophobins. RSC Adv 2017. [DOI: 10.1039/c7ra01680h] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
High quality luminescent nanosheets of MoS2 interfaced with the amphiphilic protein Vmh2.
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Affiliation(s)
- Jasneet Kaur
- Department of Physics “Ettore Pancini”
- University of Naples “Federico II”
- Naples
- Italy
| | | | - Pasqualino Maddalena
- Department of Physics “Ettore Pancini”
- University of Naples “Federico II”
- Naples
- Italy
| | - Carlo Altucci
- Department of Physics “Ettore Pancini”
- University of Naples “Federico II”
- Naples
- Italy
| | - Paola Giardina
- Department of Chemical Sciences
- University of Naples “Federico II”
- Naples
- Italy
| | - Felice Gesuele
- Department of Physics “Ettore Pancini”
- University of Naples “Federico II”
- Naples
- Italy
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97
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Yu L, Wang Q, Yang H, Zhang Q, Luo Z. Facile synthesis and enhanced electrochemical properties of reduced graphene oxide/MoS2/polyaniline ternary composites. Dalton Trans 2017; 46:9868-9874. [DOI: 10.1039/c7dt01170a] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Ternary composites of reduced graphene oxide/molybdenum disulfide/polyaniline with superior electrochemical performances were prepared via a two-stage facile synthesis.
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Affiliation(s)
- Ling Yu
- School of Materials Science and Engineering
- State Key Lab Silicon Mat
- Zhejiang University
- Hangzhou 310027
- PR China
| | - Qianqian Wang
- School of Materials Science and Engineering
- State Key Lab Silicon Mat
- Zhejiang University
- Hangzhou 310027
- PR China
| | - Hui Yang
- School of Materials Science and Engineering
- State Key Lab Silicon Mat
- Zhejiang University
- Hangzhou 310027
- PR China
| | - Qilong Zhang
- School of Materials Science and Engineering
- State Key Lab Silicon Mat
- Zhejiang University
- Hangzhou 310027
- PR China
| | - Zhongkuan Luo
- School of Materials Science and Engineering
- State Key Lab Silicon Mat
- Zhejiang University
- Hangzhou 310027
- PR China
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98
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Peterson KE, Henry RF, Zhang GGZ, MacGillivray LR. Reducing a cocrystal to nanoscale dimensions enables retention of physical crystal integrity upon dehydration. CrystEngComm 2017. [DOI: 10.1039/c7ce00826k] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We report the preparation and dehydration of a cocrystal of caffeine and 2,4-dihydroxybenzoic acid.
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Affiliation(s)
- Katherine E. Peterson
- Department of Chemistry
- University of Iowa
- Iowa City
- 52242-1294 USA
- Research and Development
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99
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Li Y, Cain JD, Hanson ED, Murthy AA, Hao S, Shi F, Li Q, Wolverton C, Chen X, Dravid VP. Au@MoS 2 Core-Shell Heterostructures with Strong Light-Matter Interactions. NANO LETTERS 2016; 16:7696-7702. [PMID: 27782405 DOI: 10.1021/acs.nanolett.6b03764] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
There are emerging opportunities to harness diverse and complex geometric architectures based on nominal two-dimensional atomically layered structures. Herein we report synthesis and properties of a new core-shell heterostructure, termed Au@MoS2, where the Au nanoparticle is snugly and contiguously encapsulated by few shells of MoS2 atomic layers. The heterostructures were synthesized by direct growth of multilayer fullerene-like MoS2 shell on Au nanoparticle cores. The Au@MoS2 heterostructures exhibit interesting light-matter interactions due to the structural curvature of MoS2 shell and the plasmonic effect from the underlying Au nanoparticle core. We observed significantly enhanced Raman scattering and photoluminescence emission on these heterostructures. We attribute these enhancements to the surface plasmon-induced electric field, which simulations show to mainly localize within the MoS2 shell. We also found potential evidence for the charge transfer-induced doping effect on the MoS2 shell. The DFT calculations further reveal that the structural curvature of MoS2 shell results in a modification of its electronic structure, which may facilitate the charge transfer from MoS2 to Au. Such Au@MoS2 core-shell heterostructures have the potential for future optoelectronic devices, optical imaging, and other energy-environmental applications.
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Affiliation(s)
- Yuan Li
- Department of Materials Science and Engineering, ‡Northwestern University Atomic and Nanoscale Characterization Experimental (NUANCE) Center, and §International Institute for Nanotechnology (IIN), Northwestern University , Evanston, Illinois 60208, United States
| | - Jeffrey D Cain
- Department of Materials Science and Engineering, ‡Northwestern University Atomic and Nanoscale Characterization Experimental (NUANCE) Center, and §International Institute for Nanotechnology (IIN), Northwestern University , Evanston, Illinois 60208, United States
| | - Eve D Hanson
- Department of Materials Science and Engineering, ‡Northwestern University Atomic and Nanoscale Characterization Experimental (NUANCE) Center, and §International Institute for Nanotechnology (IIN), Northwestern University , Evanston, Illinois 60208, United States
| | - Akshay A Murthy
- Department of Materials Science and Engineering, ‡Northwestern University Atomic and Nanoscale Characterization Experimental (NUANCE) Center, and §International Institute for Nanotechnology (IIN), Northwestern University , Evanston, Illinois 60208, United States
| | - Shiqiang Hao
- Department of Materials Science and Engineering, ‡Northwestern University Atomic and Nanoscale Characterization Experimental (NUANCE) Center, and §International Institute for Nanotechnology (IIN), Northwestern University , Evanston, Illinois 60208, United States
| | - Fengyuan Shi
- Department of Materials Science and Engineering, ‡Northwestern University Atomic and Nanoscale Characterization Experimental (NUANCE) Center, and §International Institute for Nanotechnology (IIN), Northwestern University , Evanston, Illinois 60208, United States
| | - Qianqian Li
- Department of Materials Science and Engineering, ‡Northwestern University Atomic and Nanoscale Characterization Experimental (NUANCE) Center, and §International Institute for Nanotechnology (IIN), Northwestern University , Evanston, Illinois 60208, United States
| | - Chris Wolverton
- Department of Materials Science and Engineering, ‡Northwestern University Atomic and Nanoscale Characterization Experimental (NUANCE) Center, and §International Institute for Nanotechnology (IIN), Northwestern University , Evanston, Illinois 60208, United States
| | - Xinqi Chen
- Department of Materials Science and Engineering, ‡Northwestern University Atomic and Nanoscale Characterization Experimental (NUANCE) Center, and §International Institute for Nanotechnology (IIN), Northwestern University , Evanston, Illinois 60208, United States
| | - Vinayak P Dravid
- Department of Materials Science and Engineering, ‡Northwestern University Atomic and Nanoscale Characterization Experimental (NUANCE) Center, and §International Institute for Nanotechnology (IIN), Northwestern University , Evanston, Illinois 60208, United States
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100
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Onofrio N, Guzman D, Strachan A. The dynamics of copper intercalated molybdenum ditelluride. J Chem Phys 2016; 145:194702. [DOI: 10.1063/1.4967808] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
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